NASG "S" Standards

The NASG maintains the track and wheel standards for the S-scale community. This page lists the latest accepted standards. Standards are maintained so that equipment from various manufacturers can run on track from various manufacturers. If you hand-lay track to these standards, the equipment made to these standards will run on your track.

Contact person: Steve Lunde

"Scale" vs. "Gauge"

Throughout this web site we refer to modeling in 1:64th scale as "S-scale" (the hyphen is significant). You will find magazines and other web sites using the term "S-gauge" or "S gauge". That terminology is not correct, but it has its roots in when the model railroading hobby started many decades ago. You will find similar terminology used in other scales as well (e.g. "N gauge"). The word "gauge" refers to the distance between the rails, while "scale" is the ratio of prototype (real-world) size to the modeled size. So, we may have "standard-gauge" (4'8-1/2" of spacing between the rails) and "narrow-gauge" (e.g. 3 feet between the rails), but yet locomotives that run on these rails are both scaled to 1/64th of the real thing. Due to S-scale's history being tied to American Flyer, there is further confusion in that, within the S-scale community, there are sub-divisions, such as American Flyer, hi-rail, scale, narrow-gauge, etc. Some refer to "S gauge" as meaning either American Flyer and/or hi-rail, and "S scale" as being scale modeling (standard-gauge or narrow-gauge). This is incorrect, because all models are still 1/64th of the real thing, so all are indeed S-scale. If the distinction needs to be made between "American Flyer", "hi-rail", or "scale" modeling, it will be so indicated on this site using those words as shown in these quotes. The NMRA standard uses the term "deep-flange", which would apply to S-scale's American Flyer and hi-rail modeling. Within S-scale, the difference between all of these sub-divisions really only boils down to whether or not your equipment uses deep flanges and/or A.F.-compatible claw couplers vs. more scale-like couplers. Other distinctions, such as level of detail on the models, and whether or not animated accessories are used are independent of these definitions and really a decision the modeler makes to enjoy his or her involvement in the hobby.

About the Standards

The prototype for these standards are North American rail, where the standard gauge (railhead spacing) is 4 feet, 8-1/2" wide. Narrow gauges covered here are Sn3 (3-foot spacing), and Sn2 (2-foot spacing). Sn42, which is also modeled (42" between the rails, and using HO-scale track), appears to not have any formal standards.

The NMRA standards that start with "S-" are model railroading industry standards as maintained by the NMRA and NASG. The ones starting with "RP-" are "recommended-practices", which are not standards, but are commonly followed nonetheless.

Standards Categories

Click the link of interest below, or just scroll down the page.

S-1 General Track

This table shows the minimum and maximum measurements of the distance between the railheads of general straight track for S-scale (denoted as "G" in diagrams). For hi-rail/deep-flange, minimum rail size is code 125 (see NMRA S-1.3). Note that for some, the gauge-maximum is different at the turnout frog than it is elsewhere (minimum is always the same).

 Gauge (G)Gauge at Turnout Frog (G)
 minmaxmax
standard-gauge0.883"0.905"0.895"
 22.43 mm22.99 mm22.73 mm
hi-rail0.883"0.905"0.895"
 22.43 mm22.99 mm22.73 mm
proto:640.883"0.902"0.902"
 22.43 mm22.91 mm22.91 mm
narrow-gauge (Sn3)0.563"0.585"0.575"
 14.30 mm14.86 mm14.60 mm
narrow-gauge (Sn3, proto:64)0.563"0.582"0.582"
 14.30 mm14.78 mm14.78 mm
narrow-gauge (Sn2)0.413"0.423"0.423"
 10.49 mm10.74 mm10.74 mm

RP-11 Minimum Track Curvature

This RP deals with the minimum track curvature recommended for the given equipment to be run on the track.

EquipmentMinimum Turnout #Minimum CurvePrototype RadiusModel Radius
Street cars: 2.5   36' 7"
Interurbans (in-city-streets): 3 180° 50' 9.5"
Interurbans & trailers up to 40': 3 100° 65' 12"
Interurbans & trailers up to 50': 4 80° 78' 14.5"
Interurbans & trailers up to 64': 4 60° 100' 19"
Electric up to 50'
passenger to 60' (no diaphragms)
freight to 50':
5 50° 118' 22.5"
Electric up to 60'
passenger to 60' (diaphragms):
5 40° 146' 27.5"
Electric up to 70'
passenger to 70':
6 35° 166' 31"
Small steam/diesel with 4 wheels
cars to 40':
4 60° 100' 19"
Steam up to 11' rigid wheel-base
diesel up to 40' (4-wheeled)
cars up to 50':
5 50° 118' 22.5"
Steam up to 14' rigid wheel-base
diesel up to 50' (4-wheeled)
cars up to 60':
5 40° 146' 27.5"
Steam up to 17' rigid wheel-base
diesel up to 60' (4-wheeled)
passenger up to 60'
freight up to 50':
6 35° 166' 31"
Steam up to 20' rigid wheel-base
diesel up to 60' (4-/6-wheeled)
passenger up to 70'
freight up to 62':
6 30° 193' 36"
Steam up to 24' rigid wheel-base
diesel up to 70' (4-/6-wheeled)
passenger up to 80
freight up to 85':
6 25° 231' 43.5"
Steam up to 28' rigid wheel-base: 7 20° 288' 54"

RP-15.1 Rail

This RP deals with the actual shape and dimensions of the rail. It lists the actual dimensions for the individual parts of a piece of rail of codes 32 through 297. Those are probably only useful to model rail manufacturers. However, it also provides a table that matches recommended scale rail codes to the prototype type of rail modeled, which, for S-scale, has been reproduced below. Note that in model railroading, "code" represents the height of the rail in terms of 0.001 (one-thousandths-of-an-inch). So, "code 125" is actually 0.125 inches tall.

Prototype StandardPrototype Weight
(lbs/yard)
Prototype Rail Height
(inches)
Model Rail
(code)
PRR:1558.000125
AREA:1407.312114
AREA:1327.125111
AREA:1156.625104
AREA:1006.00094
AREA:905.62588
ASCE:855.18881
ASCE:805.00078
ASCE:754.81275
ASCE:704.62572
ASCE:654.43869
ASCE:604.25066
ASCE:554.06263
ASCE:503.87561
ASCE:453.68858
ASCE:403.50055
ASCE:353.31252
ASCE:303.12549
ASCE:252.75043

References

NMRA S-1.1 Standards for Proto Models covers standard- and narrow-gauge proto:64 measurements (PDF).

NMRA S-1.2 Standards for Scale Models covers standard- and narrow-gauge general measurements (PDF).

NMRA S-1.3 Standards for Deep Flange Models covers hi-rail/deep-flange general measurements (PDF).

NMRA RP-10 Trackwork General (PDF).

NMRA RP-11 Curvature and Rolling Stock (PDF).

NMRA RP-15.1 Rail (PDF).

Prototype Rail Specifications (includes railroad-specific ones).

S-2 Couplers

This table shows the coupler height for S-scale, as measured from the top of rail to the center of the knuckle. The prototype has a tolerance of +/-1.5 inches (3.81cm).

 Coupler HeightTolerance (+/-)
standard-gauge0.531"0.023"
 13.48 mm0.58 mm
narrow-gauge0.4063"0.023"
 10.32 mm0.58 mm

References

NMRA S-2 Coupler Standards covers standard- and narrow-gauge measurements (PDF).

S-3 Turnouts

The dark-colored rails represent the stock rails. The letters in the diagram represent measurements that are provided in the tables, and only applies to non-proto:64 standards. For "G", which is the general track spacing, see S-1 above (specifically its third data column).

Standard Gauge

 min (inches)max (inches)min (mm)max (mm)
Check Gauge (C) 0.839 0.848 21.31 21.54
Span (S) 0.789 0.793 20.04 20.14
Flangeway at Wing Rail (F) 0.035 0.050 0.89 1.27
Flange Depth (H) 0.025   0.64  
Switch Point Spread (P) 0.818 0.824 20.78 20.93

Hi-rail

 min (inches)max (inches)min (mm)max (mm)
Check Gauge (C) 0.839 0.848 21.31 21.54
Span (S) 0.791 0.797 20.09 20.24
Flangeway at Wing Rail (F) 0.035 0.050 0.89 1.27
Flange Depth (H) 0.094   2.39  
Switch Point Spread (P) 0.816 0.822 20.73 20.88

Narrow-gauge (Sn3)

 min (inches)max (inches)min (mm)max (mm)
Check Gauge (C) 0.519 0.528 13.18 13.41
Span (S) 0.469 0.473 11.91 12.01
Flangeway at Wing Rail (F) 0.035 0.050 0.89 1.27
Flange Depth (H) 0.025   0.64  
Switch Point Spread (P) 0.498 0.504 12.65 12.80

Narrow-gauge (Sn2)

 min (inches)max (inches)min (mm)max (mm)
Check Gauge (C) 0.377 0.383 9.58 9.73
Span (S) 0.337 0.341 8.56 8.66
Flangeway at Wing Rail (F) 0.030 0.040 0.77 1.02
Flange Depth (H) 0.023   0.58  
Switch Point Spread (P) 0.359 0.365 9.12 9.27

Proto:64

The diagram below applies only to proto:64 standards for standard- and narrow-gauge tables below. For "G", which is the general track spacing, see S-1 above (specifically its third data column).

 min (inches)max (inches)min (mm)max (mm)
Check Gauge (C) 0.851 0.853 21.62 21.67
Span (S) 0.814 0.823 20.68 20.90
Flangeway at Frog (F) 0.028 0.030 0.710 0.760
Flangeway at Guard (F) 0.031 0.031 0.790 0.790
Flange Depth (H) 0.020   0.510  
Switch Point Spread (P)   0.809   20.55

Narrow-gauge (Sn3) Proto:64

 min (inches)max (inches)min (mm)max (mm)
Check Gauge (C) 0.530 0.533 13.46 13.54
Span (S) 0.494 0.503 12.55 12.78
Flangeway at Frog (F) 0.028 0.030 0.710 0.760
Flangeway at Guard (F) 0.032 0.032 0.810 0.810
Flange Depth (H) 0.020   0.510  
Switch Point Spread (P)   0.488   12.40

RP-12 Turnout Dimensions

This RP deals with the actual dimensions of the various pieces and rails that make up a turnout. The NMRA has documents showing the individual measurements labeled in the diagrams below for both straight and curved turnouts, in frog numbers from 4 through 20. Click the diagram to see a larger version. The documents for S-scale are copied here to our web site, because the NMRA keeps them in one large .zip file for all of the scales together. So, rather than having to download that entire file, and then needing to extract the one or two documents that you actually want, you can download them directly from our web site (see links below).


(click diagrams for a larger view)

standard straight turnout (PDF)

standard curved turnout (PDF)

hi-rail straight turnout (PDF)

hi-rail curved turnout (PDF)

proto:64 straight turnout (PDF)

proto:64 curved turnout (PDF)

References

NMRA S-3.1 Standards for Proto Models covers standard- and narrow-gauge proto:64 measurements (PDF).

NMRA S-3.2 Standards for Scale Models covers standard- and narrow-gauge general measurements (PDF).

NMRA S-3.3 Standards for Deep Flange Models covers hi-rail/deep-flange general measurements (PDF).

NMRA RP-12 Turnouts - General: general, non-scale-specific information (PDF).

NMRA RP-13.5 Guard Rail & Frog Relationship: provides more details about diagram item #30 (PDF).

NMRA RP-13.6 Guard Rails: duplicates guard rail dimensions #32, #33, #34 (PDF).

NMRA RP-13.7 Frog & Wing Rails: duplicates frog and wing rail dimensions #19, #20, #21, #22 (PDF).

NMRA RP-13.8 Flangeway Flares: provides more details about how to form flangeway flares (PDF).

Fast Tracks Templates: standard-gauge: turnouts, wyes, 3-ways, crossings, and slip switches.

Fast Tracks Templates: narrow-gauge (Sn3): turnouts, wyes, 3-ways, crossings, and dual-gauge.

Fast Tracks Templates: narrow-gauge (Sn2): turnouts and wyes.

S-4 Wheels

The letters in the diagram represent measurements that are provided in the tables.

Standard Gauge

 min (inches)max (inches)min (mm)max (mm)
Wheel Check Gauge (K) 0.830 0.839 21.08 21.31
Back to Back (B) 0.800 0.809 20.32 20.55
Wheel Width (N) 0.110 0.110 2.79 2.79
Flange Width (T)   0.030   0.76
Flange Depth (D)   0.030   0.76
Wheel Code (W) 110 110 110 110

Hi-rail

 min (inches)max (inches)min (mm)max (mm)
Wheel Check Gauge (K) 0.770 0.777 19.56 19.74
Back to Back (B) 0.705 0.712 17.91 18.09
Wheel Width (N) 0.172   4.37  
Flange Width (T) 0.063 0.067 1.60 1.70
Flange Depth (D)   0.095   2.41

Narrow-gauge (Sn3)

 min (inches)max (inches)min (mm)max (mm)
Wheel Check Gauge (K) 0.510 0.519 12.95 13.18
Back to Back (B) 0.480 0.489 12.19 12.42
Wheel Width (N) 0.110 0.110 2.79 2.79
Flange Width (T)   0.030   0.76
Flange Depth (D)   0.030   0.76
Wheel Code (W) 110 110 110 110

Narrow-gauge (Sn2)

 min (inches)max (inches)min (mm)max (mm)
Wheel Check Gauge (K) 0.370 0.377 9.40 9.58
Back to Back (B) 0.345 0.352 8.76 8.94
Wheel Width (N) 0.088 0.088 2.24 2.24
Flange Width (T)   0.025   0.64
Flange Depth (D)   0.023   0.58
Wheel Code (W) 88 88 88 88

Proto:64

 min (inches)max (inches)min (mm)max (mm)
Wheel Check Gauge (K) 0.842 0.850 21.39 21.59
Back to Back (B) 0.825 0.834 20.96 21.18
Wheel Width (N) 0.087 0.092 2.21 2.34
Flange Width (T) 0.017 0.019 0.43 0.48
Flange Depth (D) 0.018 0.020 0.46 0.51
Wheel Gauge (K + T) 0.859 0.872 21.82 22.15

Narrow-gauge (Sn3) Proto:64

 min (inches)max (inches)min (mm)max (mm)
Wheel Check Gauge (K) 0.522 0.529 13.26 13.44
Back to Back (B) 0.505 0.514 12.83 13.06
Wheel Width (N) 0.087 0.092 2.21 2.34
Flange Width (T) 0.017 0.019 0.43 0.48
Flange Depth (D) 0.018 0.020 0.46 0.51
Wheel Gauge (K + T) 0.539 0.552 13.69 14.02

RP-23 Bolsters

This RP deals with the dimensions of trucks. The purpose is to make easy interchanges of trucks between cars possible. The diagram on the right applies to the S-scale measurements listed below.

(P) Kingpin Size: 0.112" (#4)

(E) Truck Bolster Hole: 0.116 (#32 Drill)

(D) Center Plate Diameter: 3/8" max.

(Bc) Center Bolster Bearing (freight): 13/32"

(Bc) Center Bolster Bearing (passenger): 1/2"

(Bs) Side Bolster Bearing: not recommended

(Si) Distance Side (inside): not recommended

(So) Distance Side (outside): not recommended

RP-24.1 Journals

This RP deals with the dimensions of journals. The diagram on the right applies to the S-scale measurements listed below.

(J) Journal Bore min. diameter: 0.067"

(V) Journal Bore min. depth: 0.123"

(X) Journal Bore min. span: 1.314"

(W) Journal Face min. spacing: 1.068"

RP-24.3 Axles

This RP deals with the dimensions of axles. The diagram on the right applies to the S-scale measurements listed below. The standard lists this specific note for S-scale: "Axle insulating bushings are optional, and, if used, may extend beyond the outer face of the wheel. The maximum allowable distance over the outer faces of bushings shall be 1.064 inches."

(A) Axle Diameter max.: 0.063"

(Y+) Shoulder min.: 3/32"

(U) Axle Length max.: 1.310"

References

NMRA S-4.1 Standards for Proto Models covers standard- and narrow-gauge proto:64 measurements (PDF).

NMRA S-4.2 Standards for Scale Models covers standard- and narrow-gauge general measurements (PDF).

NMRA S-4.3 Standards for Deep Flange Models covers hi-rail/deep-flange general measurements (PDF).

S-Helper Service's Hi-rail Wheel Contour (.gif), provided by Don Thompson.

S-Helper Service's Hi-rail Wheelset (.gif), provided by Don Thompson.

NMRA RP-21.2 Solid Couplers (PDF); probably only of interest to coupler manufacturers.

NMRA RP-23 Bolsters (PDF).

NMRA RP-24.1 Journals (PDF).

NMRA RP-24.3 Axles (PDF).

NMRA RP-25 Wheel Contour (PDF).

S-5 Traction

This section concerns itself with standards for traction (i.e. overhead-wire) motive power.

 ImperialMetric
Overhead Contact Wire Gauge (AWG) 26 26
Overhead Contact Wire Diameter 0.016" 0.41 mm
Nominal Wire Height (City/Interurban) 3-15/16" 100 mm
Nominal Wire Height (Heavy Railroad) 4-5/16" 110 mm
Pantograph Operation Maximum Offset 5/16" 7.9 mm
Pantograph Contact Shoe Min. Length 3/4" 19.0 mm
Pole Base Mounting #60 pin (3.8")
Pole Base Mounting Car Receptacle threaded 2-56

The diagram above applies to the table below.

 ImperialMetric
Trolley Wheel Width (W) 1/16" (+/-5%) 1.6 mm (+/-5%)
Trolley Wheel Diameter (D) 1/8" (+/-5%) 3.2 mm (+/-5%)
Contact Force (minimum) 0.3 oz 0.08 N
Contact Force (maximum) 0.4 oz 0.11 N

The diagram above applies to the table below.

 ImperialMetric
Third Rail Height Above Railhead (E) 3/32" 2.4 mm
Third Rail Offset from Gauge Line (R) 7/16" 11.1 mm

References

NMRA S-5 Traction Power Collection (PDF).

S-6 Interurban Clearance & Track Centers

These clearances and track centers provide for interchange and satisfactory operation of interurban and street railway equipment only. The outside clearance is the amount of space to leave unobstructed from the outside-of-the-curve rail out. The inside clearance is the amount of space to leave unobstructed from the inside-of-the-curve rail out. Track center is measured between two tracks' centerlines (midway between the rails).

Prototype RadiusModel RadiusClearance
(inside)
Clearance
(outside)
Track Center
35' 6-9/16" 2-9/32" 1-25/32" 3-3/4"
45' 8-7/16" 2-1/32" 1-11/16" 3-1/2"
60' 11-1/4" 1-25/32" 1-5/8" 3-1/4"
75' 14-1/16" 1-21/32" 1-17/32" 3-1/16"
100' 18-3/4" 1-17/32" 1-7/16" 2-29/32"
125' 23-7/16" 1-7/16" 1-13/32" 2-13/16"
150' 28-1/8" 1-13/32" 1-3/8" 2-3/4"
175' 32-13/16" 1-3/8" 1-5/16" 2-23/32"
200' 37-1/2" 1-5/16" 1-9/32" 2-11/16"
straight 1-1/8" 1-1/8" 2-3/8"

References

NMRA S-6 Interurban Clearance & Track Centers (PDF).

S-7 Track Clearances

This standard specifies the clearances for bridges, structures, and tangent tracks for Old Time (pre-1920), Classic (1920-1969), and Modern (post 1983) eras.

 Old TimeClassicModern
 inchesmminchesmminchesmm
(A) 1-1/8 29 1-13/32 36 1-11/16 43
(B) 9/16 14 3/4 19 1-1/8 29
(C) 3/4 19 1-1/8 29 9/16 14
(D) 1-7/8 48 2-1/4 57 3 76
(E) 9/16 14 3/4 19 3/4 19
(F) 3/8 10 15/32 12 (n/a) (n/a)
(G) 1-1/32 26 1-1/8 29 1-1/8 29
(H) 3-3/16 81 4-1/8 105 4-5/16 110
(P) 1-1/32 26 1-1/8 29 1-1/16 27

References

The NMRA S-7 Clearances (PDF).

S-8 Track Centers

This standard specifies the distance between two tracks' centerlines (midway between the rails). Curved track is assumed to be eased.

Standard Gauge

 Class IIClass IClass Ia
  diesel: small 4-wheeled
steam: small, geared
(logging, branch, old-time)
diesel: large 4-, 6-wheeled
steam: longer (x-x-2)
steam: larger (x-x-4), cars: articulated passenger
usage actual scale actual scale actual scale
Handling (e.g. in yards): 2-13/16" 15' 2-13/16" 15' 2-13/16" 15'
Straight: 2-7/16" 13' 2-7/16" 13' 2-7/16" 13'
215"-radius: 2-7/16" 13' 2-9/16" 13'8" 2-11/16" 14'4"
108"-radius: 2-1/2" 13'4" 2-5/8" 14' 2-7/8" 15'4"
72"-radius: 2-9/16" 13'8" 2-3/4" 14'8" 3-1/16" 16'4"
54"-radius: 2-5/8" 14' 2-13/16" 15' 3-1/4" 17'4"
43"-radius: 2-11/16" 14'4" 2-7/8" 15'4" 3-3/8" 18'
36"-radius: 2-3/4" 14'8" 3" 16' * *
31"-radius: 2-13/16" 15' 3-1/8" 16'8" * *
27"-radius: 2-7/8" 15'4" * * * *
25"-radius: 3" 16' * * * *

* Not prohibited, but also not recommended.

Narrow-gauge (Sn3)

usageactualscale
Handling (e.g. in yards): 2-1/4" 12'
Straight: 2-1/16" 11'
215"-radius: 2-1/16" 11'
108"-radius: 2-1/16" 11'
72"-radius: 2-1/8" 11'4"
54"-radius: 2-1/4" 12'
43"-radius: 2-3/8" 12'8"
36"-radius: 2-7/16" 13'
31"-radius: 2-9/16" 13'8"
27"-radius: 2-5/8" 14'
25"-radius: 2-3/4" 14'8"

References

The NMRA S-8 Track Centers (PDF).

RP-8 Three-point Track Gauge

The design specifications for a three-point track gauge.

Standard Gauge

 Class IIClass IClass Ia
  diesel: small 4-wheeled
steam: small, geared
(logging, branch, old-time)
diesel: large 4-, 6-wheeled
steam: longer (x-x-2)
steam: larger (x-x-4), articulated
passenger cars
usage Gage Length (L) Gage Length (L) Gage Length (L)
43"-radius:     2-7/16"
31"-radius:   2-3/32"  
25"-radius: 1-7/8"    

References

The NMRA RP-8 Three Point Track Gage (PDF).

RP-20.1 Car Weight

Standard-gauge

S-scale car weight standard is: 2 ounces plus 1/2-ounce per inch of car body length.

A couple of examples are:

A standard 40-foot box car should weigh 5.75 ounces (2oz + (7.5" x 0.5oz)), or 163 grams for a 19.1cm car.

A standard 50-foot reefer should weigh 6.7 ounces (2oz + (9.375" x 0.5oz)), or 190 grams for a 23.8cm car.


(from a 1994 NASG Dispatch issue)

Narrow-gauge (Sn3)

S-scale car weight standard is: 1 ounce plus 1/2-ounce per inch of car body length.

References

The NMRA RP-20.1 Car Weight (PDF).

Modules

The S-MOD Standard

The NASG S-MOD Standards were developed so that S-scale modelers could gather from anywhere and easily join their modules into functioning, hassle-free layouts. These standards have been accepted by the NMRA Engineering Committee as the basis for the NMRA's S-scale module standards. They accommodate standard-gauge, narrow-gauge, and/or hi-rail. Track and wheel dimensional standards match those described above.

NASG S-MOD Standards (PDF)

NASG S-MOD Layout Electrical System (PDF)

References

NMRA MS-1.0 Standard-gauge module standard (PDF).

NMRA MS-1.0 Narrow-gauge module standard (PDF).

NMRA MS-1.2 Traction module standard (PDF).

NMRA MRP-1.0 Standard-gauge module recommended practices (PDF).

NMRA MRP-1.1 Narrow-gauge module recommended practices (PDF).

NMRA MRP-1.2 Traction module recommended practices (PDF).

NMRA MRP-1.2a Traction module recommended practices (PDF).

S-MOD: Examples

Don Thompson and Don DeWitt wrote a four-part article for the S Gauge Herald on how to construct S-MOD modules. These have been scanned into PDF form here:

  1. Planning the Module (PDF)
  2. Building the Benchwork (PDF)
  3. Laying the Track (PDF)
  4. Installing the Electrical System (PDF)

S-MOD: Articles

For more information about S-MOD, consider joining the Yahoo S-MOD discussion group.

Free-mo S, Sn3, Sn2 Standards

There are currently no known standards for the S-scale standard-gauge or Sn3 versions of Free-mo. However, there is one for Sn2 modules. In general, the few groups that have these types of modules simply set their own internal standards (the Canadian S Scale Workshop is one prime example of this type of layout).

Sn2 Free-mo Standard

T-TRAK (Table-Top) Modules

T-TRAK was originally developed for N-scale, but the standard now includes Z- through O-scale. The standard has very few requirements, making creativity a high priority. It is a simple, and easy-to-transport wooden box upon which track is attached. Originally developed in Japan where space is at a premium and modelers attending local trains shows have to use public transportation, the small boxes make them ultra-portable, perfect for the modeler with limited space. Set-up at shows is typically done using standard folding-legs tables, upon which the modules are placed.

In the Sep/Oct 2016 issue of the NASG's The Dispatch a photo is shown of an S-scale T-TRAK modular layout that was set up at the 2016 NASG Convention. Charles Malinowski, member of the Hoosier S Gaugers club, and others developed this layout. It currently consists of 4 straight modules and 4 curved modules. The layout has been taken to several area train shows in Indiana. Charles is planning on writing an article for the The Dispatch in 2017, so stay tuned to learn more about how they built their layout. If you are interested in T-TRAK for S-scale, contact the NASG webmaster for Charles' contact info, or log into the Members Only section of this web site to get Charles' info. He will be happy to answer any questions you might have about S-scale T-TRAK.


An S-scale T-TRAK Module with MTH track
photo © Charles Malinowski

References

The T-TRAK standard for S-scale (scroll to the bottom of that page).

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