Recommended track distances for model railroads

The following table lists the recommended track distances for the most common model tracks in standard gauge (measured from track center to track center). All dimensions are given in decimal inches:

  Z N TT H0 S 0 1
Mainline 0.748 0.984 1.339 1.811 2.480 3.504 4.921
Yards 0.827 1.102 1.496 2.047 2.795 4.055 5.551

The above listed distances have to be extended in curves in order to avoid long cars touching each other. The minimum distances for each track gauge and the longest available rolling stock can be taken from this table (all dimensions in decimal inches):

inner
curve radius
Z N TT H0 S 0 1
6.890 0.984 1.220          
7.874 0.945 1.299          
8.858 0.906 1.378          
9.843 0.866 1.299 1.575        
10.827 0.827 1.260 1.732        
11.811 0.827 1.220 1.811        
12.795 0.787 1.181 1.772 2.244      
13.780 0.787 1.142 1.693 2.441      
15.748 0.748 1.102 1.614 2.520      
17.717 0.748 1.063 1.575 2.402 2.992    
19.685 0.748 1.024 1.496 2.323 3.268    
21.654 0.748 1.024 1.457 2.244 3.465    
23.622 0.748 1.024 1.417 2.165 3.307 4.567  
27.559 0.748 0.984 1.378 2.047 3.150 4.921  
31.496 0.748 0.984 1.339 1.969 2.992 5.118  
35.433 0.748 0.984 1.339 1.890 2.874 4.843 6.063
39.370 0.748 0.984 1.339 1.850 2.756 4.646 6.535
47.244 0.748 0.984 1.339 1.811 2.638 4.370 6.654
55.118 0.748 0.984 1.339 1.811 2.520 4.134 6.260
62.992 0.748 0.984 1.339 1.811 2.480 3.976 5.945
70.866 0.748 0.984 1.339 1.811 2.480 3.858 5.709
78.740 0.748 0.984 1.339 1.811 2.480 3.740 5.512
98.425 0.748 0.984 1.339 1.811 2.480 3.543 5.197
118.110 0.748 0.984 1.339 1.811 2.480 3.504 4.961