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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: Standards & Engineering Committee Chairman

"Scale" vs. "Gauge"

Throughout this web site we refer to modeling in 1:64th scale as "S-scale". You will find magazines and other web sites using the term "S gauge". That terminology is not correct, but it has its roots in the early 1900s when the hobby of model railroading started. You will find similar terminology used in other scales as well (e.g. "N gauge", "HO gauge").

The word "gauge" refers to the distance between the rails, whereas "scale" is the ratio of prototype (real-world) size to the modeled size. As a side note, the word "gage" means "pledge". So, "gauge" should be used to represent the distance between the rails, and the device by which such distance is measured.

There are two common uses of the word gauge that we use in model railroading, namely, "standard-gauge" (4'8-1/2" of spacing between the rails) and "narrow-gauge" (e.g. 3 feet between the rails), 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 (anything that uses or requires code 125 or taller rail).

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 American Flyer-compatible claw couplers, versus more to-scale flanges and the smaller 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 are really a personal decision the modeler makes to enjoy his or her involvement in the hobby.

Past NASG presidents Roy Hoffman and Bill Winans have publicly expressed that we should start to use the term "S-scale" instead of "S gauge". Also, past NASG Vice-President Dave Heine wrote an article in the February 2009 issue of the NASG Dispatch (pg 20), explaining the difference between scale and gauge.

About the Standards

The prototype for these standards are North American rail, where the standard-gauge railhead spacing is 4 feet, 8-1/2" (56.5", 143.51cm). Narrow-gauges covered here are Sn3 (3 feet, 36", 91.44cm), and Sn2 (2 feet, 24", 60.96cm). Sn42 (a.k.a Sn3-1/2, 42", 106.68cm), which is also modeled (using HO-scale track), appears to not have any formal standards.

The current NMRA standards for S-scale (1:64) models are identical to the NASG's standards. If you visit the NMRA web site, its documents list the standards for all scales. What we have done on this page is simply filter out only the ones specifically for S-scale.

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

Straight 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 uses, the gauge-maximum is different at the turnout frog than it is elsewhere (minimum is always the same).

Gauge (G)

(G) at frog

min

max

max

standard-gauge

0.883"

0.905"

0.895"

22.43 mm

22.99 mm

22.73 mm

hi-rail

0.883"

0.905"

0.895"

22.43 mm

22.99 mm

22.73 mm

proto:64

0.883"

0.902"

0.902"

22.43 mm

22.91 mm

22.91 mm

narrow-gauge Sn3

0.563"

0.585"

0.575"

14.30 mm

14.86 mm

14.60 mm

narrow-gauge Sn3, proto:64

0.563"

0.582"

0.582"

14.30 mm

14.78 mm

14.78 mm

narrow-gauge Sn2

0.413"

0.423"

0.423"

10.49 mm

10.74 mm

10.74 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. "Model Radius" are the actual measurements for our S-scale models.

Street cars:

Minimum Turnout #

2.5

Minimum Curve

-

Prototype Radius

36'

Model Radius

7"

Interurbans (in-city-streets):

Minimum Turnout #

3

Minimum Curve

180°

Prototype Radius

50'

Model Radius

9.5"

Interurbans & trailers up to 40':

Minimum Turnout #

3

Minimum Curve

100°

Prototype Radius

65'

Model Radius

12"

Interurbans & trailers up to 50':

Minimum Turnout #

4

Minimum Curve

80°

Prototype Radius

78'

Model Radius

14.5"

Interurbans & trailers up to 64':

Minimum Turnout #

4

Minimum Curve

60°

Prototype Radius

100'

Model Radius

19"

Electric up to 50' passenger to 60' (no diaphragms) freight to 50':

Minimum Turnout #

5

Minimum Curve

50°

Prototype Radius

118'

Model Radius

22.5"

Electric up to 60' passenger to 60' (diaphragms):

Minimum Turnout #

5

Minimum Curve

40°

Prototype Radius

146'

Model Radius

27.5"

Electric up to 70' passenger to 70':

Minimum Turnout #

6

Minimum Curve

35°

Prototype Radius

166'

Model Radius

31"

Small steam/diesel with 4 wheels cars to 40':

Minimum Turnout #

4

Minimum Curve

60°

Prototype Radius

100'

Model Radius

19"

Steam up to 11' rigid wheel-base diesel up to 40' (4-wheeled) cars up to 50':

Minimum Turnout #

5

Minimum Curve

50°

Prototype Radius

118'

Model Radius

22.5"

Steam up to 14' rigid wheel-base diesel up to 50' (4-wheeled) cars up to 60':

Minimum Turnout #

5

Minimum Curve

40°

Prototype Radius

146'

Model Radius

27.5"

Steam up to 17' rigid wheel-base diesel up to 60' (4-wheeled) passenger up to 60' freight up to 50':

Minimum Turnout #

6

Minimum Curve

35°

Prototype Radius

166'

Model Radius

31"

Steam up to 20' rigid wheel-base diesel up to 60' (4-/6-wheeled) passenger up to 70' freight up to 62':

Minimum Turnout #

6

Minimum Curve

30°

Prototype Radius

193'

Model Radius

36"

Steam up to 24' rigid wheel-base diesel up to 70' (4-/6-wheeled) passenger up to 80 freight up to 85':

Minimum Turnout #

6

Minimum Curve

25°

Prototype Radius

231'

Model Radius

43.5"

Steam up to 28' rigid wheel-base:

Minimum Turnout #

7

Minimum Curve

20°

Prototype Radius

288'

Model Radius

54"

RP-15.1 Rail

This NMRA RP deals with the actual shape and dimensions of the rail. It contains the actual dimensions for the individual parts of a piece of rail (rail head height, curvature, etc.), providing dimensions for codes 32 through 297. Those are probably only useful to manufacturers of model rail.

However, that RP also provides a table that matches recommended scale rail codes to the prototype type of rail modeled. We have reproduced the S-scale portion of that list below. The definition of the columns are as follows:

Prototype Weight: In the real world, rail is measured by weight, and so the numbers shown below indicate the number of pounds per yard (~3 meters) of rail.

Prototype Height: The physical height, in inches, of the rail, which is typical for that size of rail.

Model Rail: 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, or 1/8", tall. Within S-scale, typical rail codes used are 100, 88, 70, 55, and 40 for "scale" standard-gauge and narrow-gauge modeling. For S-scale, the NMRA defines deep-flange (a.k.a. hi-rail) as anything that uses code 125 or taller. Of course, choice of rail height is the modeler's prerogative, usually based on wheelsets used, prototype railroad modeled, etc. This listing is simply provided as reference.

Prototype Standard

Prototype Weight

Prototype Height

Model Rail

PRR:

155

8.000

125

AREA:

140

7.312

114

AREA:

132

7.125

111

AREA:

115

6.625

104

AREA:

100

6.000

94

AREA:

90

5.625

88

ASCE:

85

5.188

81

ASCE:

80

5.000

78

ASCE:

75

4.812

75

ASCE:

70

4.625

72

ASCE:

65

4.438

69

ASCE:

60

4.250

66

ASCE:

55

4.062

63

ASCE:

50

3.875

61

ASCE:

45

3.688

58

ASCE:

40

3.500

55

ASCE:

35

3.312

52

ASCE:

30

3.125

49

ASCE:

25

2.750

43

Ties

In North America, standard-gauge track uses wooden railroad ties which measure 8'6" (2.59m) in length, 7" (17.78cm) tall, and 9" (22.86cm) wide. The distance between the ties is typically 21" (53.34cm), so with 9"-wide ties that makes the gap between ties 12" (30.48cm). This equates to 3,000 ties per mile (1.604km).

Wooden ties provide "give" which makes the rail and the equipment riding on the rail last longer. Wooden ties are impregnated with a creosote preservative so that they can last 25 to 30 years. They weigh around 225lbs (100kg) each. Concrete ties are being used in newer track in North America. Their "give" is between the ties and the ballast. They weigh around 700lbs (318kg) each.

References

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 Height

Tolerance (+/-)

standard-gauge

0.531"

0.023"

13.48 mm

0.58 mm

narrow-gauge

0.4063"

0.023"

10.32 mm

0.58 mm

References

  • NMRA S-2 Coupler Standards covers standard- and narrow-gauge measurements (PDF).
  • The image on the right comes from the Kadee web site showing their S-scale #802/808 coupler, but the coupler type is not important. It does, however, provide a visual of the above-mentioned standards for standard-gauge couplers (17/32 = 0.531).

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 (in)

max (in)

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 (in)

max (in)

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 (in)

max (in)

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 (in)

max (in)

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 (in)

max (in)

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 (in)

max (in)

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. 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).

References

S-4 Wheels

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

Standard Gauge

min (in)

max (in)

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 (in)

max (in)

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 (in)

max (in)

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 (in)

max (in)

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 (in)

max (in)

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 (in)

max (in)

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 it easy to interchange trucks between cars. The diagram below applies to the S-scale measurements listed below it.

(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 below applies to the S-scale measurements listed below it.

(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 below applies to the S-scale measurements listed below it. 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

S-5 Traction

This section concerns itself with standards for traction motive power.

Overhead Wire

Imperial

Metric

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

Trolley Wheel

The diagram below applies to the S-scale measurements listed below it.

Imperial

Metric

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

Third-rail

The diagram below applies to the S-scale measurements listed below it.

Imperial

Metric

Third Rail Height Above Railhead (E)

3/32"

2.4 mm

Third Rail Offset from Gauge Line (R)

7/16"

11.1 mm

References

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). All dimensions given apply to S-scale models only.

Prototype Radius

Model Radius

Clearance (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

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. The NASG sells clearance gauges for the "Classic" and "Modern" eras (click on "Store" on the left, then "NASG Company Store").

Old Time

Classic

Modern

in

mm

in

mm

in

mm

(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

S-8 Track Centers

This standard specifies the distance between two tracks' centerlines (midway between the rails). Curved track is assumed to be eased. "Actual" is the actual measurement for S-scale models.

Standard Gauge

In the standard-gauge table below, the following represents the kind of equipment presumed to be running on the tracks.

  • Class II:
    diesel: small 4-wheeled
    steam: small, geared (logging, branch, old-time).
  • Class I:
    diesel: large 4-, 6-wheeled
    steam: longer (x-x-2).
  • Class Ia:
    diesel: (any)
    steam: larger (x-x-4)
    cars: articulated passenger.

Class II

Class I

Class Ia

usage

actual

scale

actual

scale

actual

scale

Yards:

2-13/16"

15'

2-13/16"

15'

2-13/16"

15'

Sidings:

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)

usage

actual

scale

Yards:

2-1/4"

12'

Sidings:

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

RP-8 Three-point Track Gauge

The design specifications for a three-point track gauge. So far only the standard-gauge version has been defined and standardized. See the previous section for the definitions of "Class II", "Class I", and "Class Ia". For "G", which is the general track spacing, see S-1 above.

For Class II, the gauge length (L) at a 25" radius is 1-7/8".

For Class I, the gauge length (L) at a 31" radius is 2-3/32".

For Class Ia, the gauge length (L) at a 43" radius is 2-7/16".

References

RP-20.1 Car Weight

Standard-gauge

The S-scale car weight standard is as follows:

imperial

2 ounces plus 1/2 ounce per inch of car body length.

metric

56.7 grams plus 5.58 gram per centimeter 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)

The car weight standard is as follows:

imperial

1 ounce plus 1/2 ounce per inch of car body length.

metric

28.35 grams plus 5.58 gram per centimeter of car body length.

References

Modules

For any of our S-MOD documentation, see our dedicated S-MOD Modules page.

For any of the S-scale version of the T-TRAK system, see our dedicated T-TRAK Modules page.

For any of the S-scale versions of the Free-mo system, see our dedicated Free-mo Modules page.

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