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Crain's Scale / Gauge Encyclopedia
15 Scale Name:  SE Scale    M Scale        
  Scale Ratio:  1:13.5    
  Alternate Names:  7/8 Inch Scale 22.6 mm Scale  1:13.5 Scale  
     Represented   Scale       Model Track Gauge Error  Track
  Ser #     Gauge  Inches Ratio   In/ft  mm/ft       Inches           mm %  Used
  Correct Gauge:      
15 263  4ft 8.5in 56.5 13.5 0.889 22.6 4.19   106.30   0.0  
15 264  Meter 39.4 13.5 0.889 22.6 2.92   74.13   0.0  
15 265  3 Foot 36 13.5 0.889 22.6 2.67   67.73   0.0  
15 266  2.5 Foot 30 13.5 0.889 22.6 2.22   56.44   0.0  
15 267  2 Foot 24 13.5 0.889 22.6 1.78   45.16   0.0  
15 268  15 Inch 15 13.5 0.889 22.6 1.11   28.22   0.0  
  Commonly Used Gauges        
15 269  SE45 Gauge 56.5 13.5 0.889 22.6 4.173   105.99   -0.3  
15 269a  M Gauge 56.5 13.5 0.889 22.6 4.173   105.99   -0.3  
15 270  4" Gauge 56.5 13.5 0.889 22.6 4.000   101.60   -4.4  
15 271  Mn3 Gauge 36 13.5 0.889 22.6 2.750   69.85   3.1  
15 272  7/8"n3 Gauge 36 13.5 0.889 22.6 2.750   69.85   3.1  
15 273  Mn2 Gauge 24 13.5 0.889 22.6 1.766 1.820 44.86 46.23 -0.7  Ga.1
15 274  LS13.5 Gauge 24 13.5 0.889 22.6 1.766 1.820 44.86 46.23 -0.7  Ga.1
15 275  45 mm Gauge 24 13.5 0.889 22.6 1.766 1.820 44.86 46.23 -0.7  Ga.1
15 276  1-3/4" Ga 24 13.5 0.889 22.6 1.766 1.820 44.86 46.23 -0.7  Ga.1
15 277  Gauge 1 24 13.5 0.889 22.6 1.766 1.820 44.86 46.23 -0.7  Ga.1
15 278  7/8"n2 Ga 24 13.5 0.889 22.6 1.766 1.820 44.86 46.23 -0.7  Ga.1
15 279  13.5 / 45 Ga 24 13.5 0.889 22.6 1.766 1.820 44.86 46.23 -0.7  Ga.1
15 280  Mn18 Gauge 18 13.5 0.889 22.6 1.250 1.285 31.75 32.64 -6.3  Ostd 
15 281  7/8"n18 Ga 18 13.5 0.889 22.6 1.250 1.285 31.75 32.64 -6.3  Ostd 
15 282  SM32 Gauge 18 13.5 0.889 22.6 1.250 1.285 31.75 32.64 -6.3  Ostd 
15 282a  O Ga USA 18 13.5 0.889 22.6 1.250 1.285 31.75 32.64 -6.3  Ostd 
15 283  Mn15 Gauge 15 13.5 0.889 22.6 1.125 1.285 28.58 32.64 1.3  
15 284  7/8"n15 Ga 15 13.5 0.889 22.6 1.125 1.285 28.58 32.64 1.3  
15 285  1-1/8" Gauge 15 13.5 0.889 22.6 1.125 1.285 28.58 32.64 1.3  
               
This is a relatively new entrant in the Scale Wars. but the use of Gauge 1 track to represent    
2 foot gauge is an obvious step. Sometimes quoted as 1:13.7 Scale, which makes it precisely  
7/8 inch Scale.          
           
Crain's Scale / Gauge Encyclopedia
16 Scale Name:  D Scale          
  Scale Ratio:  1:16    
  Alternate Names:  3/4 Inch Scale III Scale (in Europe) "III"=Roman Nm Threee
       3/4 inch = 1 foot Number 4 Scale (in USA)  
     Represented Scale       Model Track Gauge Error  Track
  Ser #    Gauge  Inches Ratio   In/ft  mm/ft       Inches           mm %  Used
  Correct Gauge:      
16 286  4ft 8.5in 56.5 16 0.750 19.1 3.53   89.69   0.0  
16 287  Meter 39.4 16 0.750 19.1 2.46   62.55   0.0  
16 288  3 Foot 36 16 0.750 19.1 2.25   57.15   0.0  
16 289  2.5 Foot 30 16 0.750 19.1 1.88   47.63   0.0  
16 290  2 Foot 24 16 0.750 19.1 1.50   38.10   0.0  
16 291  15 Inch 15 16 0.750 19.1 0.94   23.81   0.0  
  Commonly Used Gauges        
16 292  4" Gauge 56.5 16 0.750 19.1 4.000   101.60   13.3  
16 293  3-7/8" Ga 56.5 16 0.750 19.1 3.875   98.43   9.7  
16 294  3-3/4" Ga 56.5 16 0.750 19.1 3.750   95.25   6.2  
16 295  3-5/8" Ga 56.5 16 0.750 19.1 3.625   92.08   2.7  
16 296  D Gauge 56.5 16 0.750 19.1 3.504   89.00   -0.8  
16 297  Proto 16 56.5 16 0.750 19.1 3.531   89.69   0.0  
16 298  Gauge III 56.5 16 0.750 19.1 3.500 3.605 88.90 91.57 -0.9  Ga.4
16 299  3-1/2" Ga 56.5 16 0.750 19.1 3.500 3.605 88.90 91.57 -0.9  Ga.4
16 300  Gauge 4 56.5 16 0.750 19.1 3.500 3.605 88.90 91.57 -0.9  Ga.4
16 301  Dn42 Gauge 42 16 0.750 19.1 2.520   64.01   -4.0  Ga.3
16 302  Dm Gauge 39.4 16 0.750 19.1 2.362   59.99   -4.1  Ga.3
16 303  3/4"m Ga 39.4 16 0.750 19.1 2.500 2.566 63.50 65.18 1.5  Ga.3
16 304  Gauge 3 39.4 16 0.750 19.1 2.500 2.566 63.50 65.18 1.5  Ga.3
16 305  Proto 16n3 36 16 0.750 19.1 2.250   57.15 0.00 0.0  
16 306  Ga IIIn3 36 16 0.750 19.1 1.766 1.820 44.86 46.23 -21.5  Ga.1
16 307  3/4"n2.5 30 16 0.750 19.1 1.766 1.820 44.86 46.23 -5.8  Ga.1
16 308  LS16 Gauge 30 16 0.750 19.1 1.766 1.820 44.86 46.23 -5.8  Ga.1
16 309  1-3/4" Ga 30 16 0.750 19.1 1.766 1.820 44.86 46.23 -5.8  Ga.1
16 310  Gauge IIIe 30 16 0.750 19.1 1.766 1.820 44.86 46.23 -5.8  Ga.1
16 311  Gauge 1 30 16 0.750 19.1 1.766 1.820 44.86 46.23 -5.8  Ga.1
16 312  16 / 45 Ga 30 16 0.750 19.1 1.766 1.820 44.86 46.23 -5.8  Ga.1
16 313  3/4"m760 29.9 16 0.750 19.1 1.766 1.820 44.86 46.23 -5.5  Ga.1
16 314  3/4"m750 29.5 16 0.750 19.1 1.766 1.820 44.86 46.23 -4.2  Ga.1
16 315  LS16 Gauge 27 16 0.750 19.1 1.766 1.820 44.86 46.23 4.7  Ga.1
16 316  45 mm Gauge 27 16 0.750 19.1 1.766 1.820 44.86 46.23 4.7  Ga.1
16 317  1-3/4" Ga 27 16 0.750 19.1 1.766 1.820 44.86 46.23 4.7  Ga.1
16 318  16 / 45 Ga 27 16 0.750 19.1 1.766 1.820 44.86 46.23 4.7  Ga.1
16 319  Gauge 1 27 16 0.750 19.1 1.766 1.820 44.86 46.23 4.7  Ga.1
16 320  LS16 Gauge 24 16 0.750 19.1 1.766 1.820 44.86 46.23 17.7  Ga.1
16 321  45 mm Gauge 24 16 0.750 19.1 1.766 1.820 44.86 46.23 17.7  Ga.1
16 322  1-3/4" Ga 24 16 0.750 19.1 1.766 1.820 44.86 46.23 17.7  Ga.1
16 323  16 / 45 Ga 24 16 0.750 19.1 1.766 1.820 44.86 46.23 17.7  Ga.1
16 324  Gauge 1 24 16 0.750 19.1 1.766 1.820 44.86 46.23 17.7  Ga.1
16 325  3/4"n20 20 16 0.750 19.1 1.250 1.285 31.75 32.64 0.0  Ostd 
16 326  O Ga USA 20 16 0.750 19.1 1.250 1.285 31.75 32.64 0.0  Ostd 
16 327  3/4"n500 19.7 16 0.750 19.1 1.250 1.285 31.75 32.64 1.5  Ostd 
           
This is a popular live steam scale. Many model cars, trucks, and tractors are  
sold at 1:16 and 1:18 scales. A railway model scale of 1:17.5 is noted.  
       
Crain's Scale / Gauge Encyclopedia
17 Scale Name:  16 mm Scale        
  Scale Ratio:  1:19.1    
  Alternate Names:  16.0 mm =1 foot  2-7/8 Inch Gauge (as a scale name)
       SM Scale    5/8 Inch Scale        
     Represented   Scale       Model Track Gauge Error  Track
  Ser #    Gauge  Inches Ratio   In/ft  mm/ft       Inches           mm %  Used
  Correct Gauge:      
17 328  4ft 8.5in 56.5 19.1 0.628 16.0 2.96   75.14   0.0  
17 329  Meter 39.4 19.1 0.628 16.0 2.06   52.40   0.0  
17 330  3 Foot 36 19.1 0.628 16.0 1.88   47.87   0.0  
17 331  2.5 Foot 30 19.1 0.628 16.0 1.57   39.90   0.0  
17 332  2 Foot 24 19.1 0.628 16.0 1.26   31.92   0.0  
17 333  15 Inch 15 19.1 0.628 16.0 0.79   19.95   0.0  
  Commonly Used Gauges        
17 334  3-1/2" Ga 66 19.1 0.628 16.0 3.500   88.90   1.3  Ga.4
17 335  Gauge 4 66 19.1 0.628 16.0 3.500   88.90   1.3  Ga.4
17 336  3-1/4" Ga 66 19.1 0.628 16.0 3.250   82.55   -5.9  
17 337  3" Gauge 56.5 19.1 0.628 16.0 3.000   76.20   1.4  
17 338  2-7/8" Ga 56.5 19.1 0.628 16.0 2.875   73.03   -2.8  
17 339  Old Ga 3 56.5 19.1 0.628 16.0 2.835   72.01   -4.2  
17 340  2-3/4" Ga 56.5 19.1 0.628 16.0 2.750   69.85   -7.0  
17 341  2-5/8" Ga 42 19.1 0.628 16.0 2.675   67.95   21.6  
17 342  2-1/2" Ga 42 19.1 0.628 16.0 2.675   67.95   21.6  
17 343  2" Gauge 39.4 19.1 0.628 16.0 2.000   50.80   -3.0  Ga.2
17 344  Gauge 2 39.4 19.1 0.628 16.0 2.000   50.80   -3.0  Ga.2
17 345  LS19 Gauge 36 19.1 0.628 16.0 1.766 1.820 44.86 46.23 -6.3  Ga.1
17 346  45 mm Gauge 36 19.1 0.628 16.0 1.766 1.820 44.86 46.23 -6.3  Ga.1
17 347  1-3/4" Ga 36 19.1 0.628 16.0 1.766 1.820 44.86 46.23 -6.3  Ga.1
17 348  Gauge 1 36 19.1 0.628 16.0 1.766 1.820 44.86 46.23 -6.3  Ga.1
17 349  19.1 / 45 Ga 36 19.1 0.628 16.0 1.766 1.820 44.86 46.23 -6.3  Ga.1
17 350  SM45 36 19.1 0.628 16.0 1.766 1.820 44.86 46.23 -6.3  Ga.1
17 351  1-1/4" Ga 24 19.1 0.628 16.0 1.250 1.285 31.75 32.64 -0.5  Ostd 
17 352  O Ga USA 24 19.1 0.628 16.0 1.250 1.285 31.75 32.64 -0.5  Ostd 
17 353  SM32 24 19.1 0.628 16.0 1.250 1.285 31.75 32.64 -0.5  Ostd 
17 354  On Gauge 24 19.1 0.628 16.0 1.250 1.285 31.75 32.64 -0.5  Ostd 
           
Models in this scale are fairly rare, but British modelers like it for live  
steam and electric outdoor (Garden) railways. Alternate scale ratio is   
1:19.65 or 15.5 mm =1 foot. Also 11/16 Scale (1:17.5 ratio) is mentioned.
       
Crain's Scale / Gauge Encyclopedia
18 Scale Name:  F Scale          
  Scale Ratio:  1:20.3    
  Alternate Names:  3/5 Inch Scale 15 mm Scale  1:20.3 Scale  
     Represented   Scale       Model Track Gauge Error  Track
  Ser #    Gauge  Inches Ratio   In/ft  mm/ft       Inches           mm %  Used
  Correct Gauge:      
18 355  4ft 8.5in 56.5 20.3 0.591 15.0 2.78   70.69   0.0  
18 356  Meter 39.4 20.3 0.591 15.0 1.94   49.30   0.0  
18 357  3 Foot 36 20.3 0.591 15.0 1.77   45.04   0.0  
18 358  2.5 Foot 30 20.3 0.591 15.0 1.48   37.54   0.0  
18 359  2 Foot 24 20.3 0.591 15.0 1.18   30.03   0.0  
18 360  15 Inch 15 20.3 0.591 15.0 0.74   18.77   0.0  
  Commonly Used Gauges        
18 361  3" Gauge 56.5 20.3 0.591 15.0 3.000   76.20   7.8  
18 362  2-7/8" Ga 56.5 20.3 0.591 15.0 2.875   73.03   3.3  
18 363  F Gauge 56.5 20.3 0.591 15.0 2.718   69.04   -2.3  
18 364  Old Ga 3 56.5 20.3 0.591 15.0 2.835   72.01   1.9  
18 365  Fm Gauge 39.4 20.3 0.591 15.0 1.949   49.50   0.4 Ga.2
18 366  2" Gauge 39.4 20.3 0.591 15.0 2.000   50.80   3.0 Ga.2
18 367  Gauge 2 39.4 20.3 0.591 15.0 2.000   50.80   3.0 Ga.2
18 368  Fn3 Gauge 36 20.3 0.591 15.0 1.766 1.820 44.86 46.23 -0.4 Ga.1
18 369  LS20.3 Gauge 36 20.3 0.591 15.0 1.766 1.820 44.86 46.23 -0.4 Ga.1
18 370  45 mm Gauge 36 20.3 0.591 15.0 1.766 1.820 44.86 46.23 -0.4 Ga.1
18 371  1-3/4" Ga 36 20.3 0.591 15.0 1.766 1.820 44.86 46.23 -0.4 Ga.1
18 372  Gauge 1 36 20.3 0.591 15.0 1.766 1.820 44.86 46.23 -0.4 Ga.1
18 372a  SM45 Fauce 36 20.3 0.591 15.0 1.766 1.820 44.86 46.23 -0.4 Ga.1
18 373  20.3 / 45 Ga 36 20.3 0.591 15.0 1.766 1.820 44.86 46.23 -0.4 Ga.1
18 374  Fn30 Gauge 30 20.3 0.591 15.0 1.476   37.49   -0.1  
18 375  Fn2 Gauge 24 20.3 0.591 15.0 1.181   30.00   -0.1 Ostd 
18 376  1-1/4" Ga 24 20.3 0.591 15.0 1.250 1.285 31.75 32.6 5.7 Ostd 
18 376a  SM32 Gausge 24 20.3 0.591 15.0 1.250 1.285 31.75 32.6 5.7 Ostd 
18 377  O Ga USA 24 20.3 0.591 15.0 1.250 1.285 31.75 32.6 5.7 Ostd 
       
This is a popular fine scale and is slowly replacing G Scale as the North American
scale for 3 foot narrow gauge on 45 mm track. Numerous parts and supplies are  
available. for both live steam and electric powered models. Some autos are made in  
this scale. Some earlier models were made to 1:20 scale.
   
Crain's Scale / Gauge Encyclopedia
19 Scale Name:  14 mm Scale        
  Scale Ratio:  1:21.8    
  Alternate Names:  14 mm = 1 foot              
     Represented    Scale       Model Track Gauge Error  Track
  Ser #     Gauge  Inches Ratio   In/ft  mm/ft       Inches           mm %  Used
  Correct G

auge:

     
19 378  4ft 8.5in 56.5 21.8 0.550 14.0 2.592   65.83   0.0  
19 379  Meter 39.4 21.8 0.550 14.0 1.807   45.91   0.0  
19 380  3 Foot 36 21.8 0.550 14.0 1.651   41.94   0.0  
19 381  2.5 Foot 30 21.8 0.550 14.0 1.376   34.95   0.0  
19 382  2 Foot 24 21.8 0.550 14.0 1.101   27.96   0.0  
19 383  15 Inch 15 21.8 0.550 14.0 0.688   17.48   0.0  
  Commonly Used Gauges        
19 384  2-7/8" Ga 60 21.8 0.550 14.0 2.875   73.03   4.5  
19 385  Old Ga 3 56.5 21.8 0.550 14.0 2.835   72.01   9.4  
19 386  2-1/2" Ga 56.5 21.8 0.550 14.0 2.500 2.566 63.50 65.18 -3.5 Ga.3 
19 387  Gauge 3 56.5 21.8 0.550 14.0 2.500 2.566 63.50 65.18 -3.5 Ga.3 
19 388  1-3/4" Ga 39.4 21.8 0.550 14.0 1.766 1.820 44.86 46.23 -2.3 Ga.1
19 389  Gauge 1 39.4 21.8 0.550 14.0 1.766 1.820 44.86 46.23 -2.3 Ga.1
19 390  21.8 / 45 Ga 39.4 21.8 0.550 14.0 1.766 1.820 44.86 46.23 -2.3 Ga.1
19 391  1-3/4" Ga 36 21.8 0.550 14.0 1.766 1.820 44.86 46.23 6.9 Ga.1
19 392  Gauge 1 36 21.8 0.550 14.0 1.766 1.820 44.86 46.23 6.9 Ga.1
19 393  21.8 / 45 Ga 36 21.8 0.550 14.0 1.766 1.820 44.86 46.23 6.9 Ga.1
19 394  1-1/4" Ga 30 21.8 0.550 14.0 1.250 1.285 31.75 32.64 -9.2 Ostd 
19 395  O Ga USA 30 21.8 0.550 14.0 1.250 1.285 31.75 32.64 -9.2 Ostd 
19 396  On Gauge 30 21.8 0.550 14.0 1.250 1.285 31.75 32.64 -9.2 Ostd 
       
Many toy trains from the early 1900's are made to approximately this scale.
Some current models are also available and are interchangeable with G Scale  
equipment. Scale models (live steam) were also common in early 1900's.
   
Crain's Scale / Gauge Encyclopedia
20 Scale Name:  G Scale   IIm Scale (1:22.5)         
  Scale Ratio:  1:22.6    
  Alternate Names:  17/32 Inch Scale 13.5 mm Scale  1:22.6 Scale
       II Scale (in Europe)    LGB Scale (bad usage)      
     Represented  Scale       Model Track Gauge Error  Track
  Ser #     Gauge  Inches Ratio   In/ft  mm/ft       Inches           mm %  Used
  Correct Gauge:      
20 397  4ft 8.5in 56.5 22.6 0.531 13.5 2.500   63.50   0.0  
20 398  Meter 39.4 22.6 0.531 13.5 1.743   44.28   0.0  
20 399  3 Foot 36 22.6 0.531 13.5 1.593   40.46   0.0  
20 400  2.5 Foot 30 22.6 0.531 13.5 1.327   33.72   0.0  
20 401  2 Foot 24 22.6 0.531 13.5 1.062   26.97   0.0  
20 402  15 Inch 15 22.6 0.531 13.5 0.664   16.86   0.0  
  Commonly Used Gauges        
20 403  Spur II 56.5 22.6 0.531 13.5 2.519   63.98   0.8 G Ga
20 404  2-1/2" Ga 56.5 22.6 0.531 13.5 2.500 2.566 63.50 65.18 0.0 Ga.3
20 405  Gauge 3 56.5 22.6 0.531 13.5 2.500 2.566 63.50 65.18 0.0 Ga.3
20 406  2-3/8" Ga 56.5 22.6 0.531 13.5 2.375   60.33   -5.0  
20 407  2-1/8" Ga 56.5 22.6 0.531 13.5 2.125   53.98   -15.0  
20 408  LS22.5 Gauge 39.4 22.6 0.531 13.5 1.766 1.820 44.86 46.23 1.3 Ga.1
20 409  45 mm Gauge 39.4 22.6 0.531 13.5 1.766 1.820 44.86 46.23 1.3 Ga.1
20 410  LBM Gauge 39.4 22.6 0.531 13.5 1.766 1.820 44.86 46.23 1.3 Ga.1
20 411  I Gauge 39.4 22.6 0.531 13.5 1.766 1.820 44.86 46.23 1.3 Ga.1
20 411a  SM45 Gauge 39.4 22.6 0.531 13.5 1.766 1.820 44.86 46.23 1.3 Ga.1
20 412  #1 Gauge 39.4 22.6 0.531 13.5 1.766 1.820 44.86 46.23 1.3 Ga.1
20 413  IIm Gauge 39.4 22.6 0.531 13.5 1.766 1.820 44.86 46.23 1.3 Ga.1
20 414  G Gauge ** 39.4 22.6 0.531 13.5 1.766 1.820 44.86 46.23 1.3 Ga.1
20 415  LGB Gauge 39.4 22.6 0.531 13.5 1.766 1.820 44.86 46.23 1.3 Ga.1
20 416  G-45 Gauge 39.4 22.6 0.531 13.5 1.766 1.820 44.86 46.23 1.3 Ga.1
20 417  1-3/4" Ga 39.4 22.6 0.531 13.5 1.766 1.820 44.86 46.23 1.3 Ga.1
20 418  Gauge 1 39.4 22.6 0.531 13.5 1.766 1.820 44.86 46.23 1.3 Ga.1
20 419  Gm Gauge 39.4 22.6 0.531 13.5 1.766 1.820 44.86 46.23 1.3 Ga.1
20 420  Gnm Gauge 39.4 22.6 0.531 13.5 1.766 1.820 44.86 46.23 1.3 Ga.1
20 421  22.6 / 45 Ga 39.4 22.6 0.531 13.5 1.766 1.820 44.86 46.23 1.3 Ga.1
20 422  LS22.5 Gauge 36 22.6 0.531 13.5 1.766 1.820 44.86 46.23 10.9 Ga.1
20 423  45 mm Gauge 36 22.6 0.531 13.5 1.766 1.820 44.86 46.23 10.9 Ga.1
20 424  LBM Gauge 36 22.6 0.531 13.5 1.766 1.820 44.86 46.23 10.9 Ga.1
20 425  I Gauge 36 22.6 0.531 13.5 1.766 1.820 44.86 46.23 10.9 Ga.1
20 426  #1 Gauge 36 22.6 0.531 13.5 1.766 1.820 44.86 46.23 10.9 Ga.1
20 427  IIm Gauge 36 22.6 0.531 13.5 1.766 1.820 44.86 46.23 10.9 Ga.1
20 428  G Gauge ** 36 22.6 0.531 13.5 1.766 1.820 44.86