KEY TO DIAGRAM

TG
(Track Gauge)

T
(Tire Width)

W
(Flange Width)

F
(Flange Depth)

R
(Fillet Radius)

B
(Back to Back)

G
(Wheel Gauge)

WC
(Wheel Check)

H*
(Coupler Height)

PROTOTYPE

56.500

5.500

1.156

1.125

0.688

53.380

N/A

54.530

?

1:32 Scaled Prototype

1.766

0.172

0.036

0.035

0.022

1.668

1.704

Gauge No. 1 Standard

1.766
MIN.

0.235
MIN.

0.064
MAX.

1.567
MIN.

1.660
MAX.

1.125
** 

1:16 Scaled Prototype

3.531

0.344

0.072

0.070

0.043

3.336

3.408

3/4 Inch Scale Standard

3.500
MIN.

0.406
MIN.

0.094
MAX.

0.094
MAX.

0.047
+/-.008

3.281
+.020/-0

3.470
+0/-.020

3.375
REF.

2.250

1:12 Scaled Prototype

4.708

0.458

0.096

0.094

0.057

4.448

4.544

1 Inch Scale Standard

4.750
MIN.

0.505
MIN.

0.125
MAX.

0.140
MAX.

0.062
+/-.010

4.437
+.020/-0

4.690
+0/-.020

4.562
REF.

2.875

1:8 Scaled Prototype

7.062

0.688

0.144

0.141

0.086

6.672

6.816

1-1/2 Inch Scale Standard
 North East.

7.250
MIN.

0.750
MIN.

0.156
MAX.

0.187
MAX.

0.094
+/-.015

6.870
+.020/-0

7.190
+0/-.020

7.031
REF.

4.4375

1-1/2 Inch Scale Standard
West & South. 

7.500
MIN.

0.750
MIN.

0.156
MAX.

0.187
MAX.

0.094
+/-.015

7.120
+.020/-0

7.440
+0/-.020

7.281
REF.

4.4375