Grades and Curvature
Tables


Grade Inches
Height Lenght
2.80% 2 72
2.40% 2 84
2.10% 2 96
2.00% 2 100
1.85% 2 108
1.70% 2 120
1.50% 2 132
1.40% 2 144
1.30% 2 156
1.20% 2 168
1.10% 2 180
1.05% 2 192
1.00% 2 200

Prototype

Degrees N-Scale
Feet Remark Feet Inches
2864.93   2.0 17.91 214.90
2292.01   2.5 14.33 171.90
1910.08   3.0 11.94 143.30
1637.28 Moderate 3.5 10.23 122.80
1432.69   4.0 8.95 107.50
1273.57   4.5 7.96 95.50
1146.28   5.0 7.16 86.00
1042.14   5.5 6.51 78.20
955.37   6.0 5.97 71.70
895.00   6.5 5.51 66.10
819.02 Sharp 7.0 5.12 61.40
764.49   7.5 4.78 57.30
716.78   8.0 4.48 53.80
674.69   8.5 4.22 50.60
637.27   9.0 3.98 47.80
603.80   9.5 3.77 45.30
573.69 Very sharp 10.0 3.59 43.00
546.44   10.5 3.42 41.00
521.67   11.0 3.26 39.10
499.06   11.5 3.12 37.40
478.34   12.0 2.99 35.90
459.28   12.5 2.87 34.40
441.68   13.0 2.76 33.10
425.40   13.5 2.66 31.90
410.28 Extremely sharp 14.0 2.56 30.80
396.20   14.5 2.48 29.70
383.06   15.0 2.39 28.70
370.78   15.5 2.32 27.80
359.26 Max. US Mainline 16.0 2.25 26.90
342.00 6-axle w/train     25.65
338.27   17.0 2.11 25.40
319.62 Industry lead 18.0 2.00 24.00
302.94   19.0 1.89 22.70
303.00 4-axle w/train     22.65
287.94 NH EP5 20.0 1.80 21.60
274.37   21.0 1.71 20.60
262.04   22.0 1.64 19.70
250.79 Coupled limit, cars 23.0 1.57 18.80
240.49   24.0 1.50 18.00
231.01   25.0 1.44 17.30
222.27   26.0 1.39 16.70
214.18   27.0 1.34 16.10
206.68   28.0 1.29 15.50
199.70 Uncoupled Limit 29.0 1.25 15.00
195.00 6-axle w/o train     14.63
193.19   30.0 1.21 14.50
187.10   31.0 1.17 14.00
181.40   32.0 1.13 13.60
140.00 4-axle w/o train     10.50
Formula: r=50/sin(a/2)

Degree Prototype O S OO HO TT N
1 5729.650       789.3890    
2 2864.930       394.7090    
3 1910.080       263.1570    
4 1432.680       197.3840    
5 1146.280 3820.1600     157.9260    
6 955.364       131.6230    
7 819.021       112.8390    
8 716.781       98.7528    
9 637.273       87.7988    
10 573.685       79.0381    
20 288.000 72.0000 54.0000 45.5000 40.0000 29.0000 21.5000
25 231.000 58.0000 43.5000 36.5000 32.0000 23.0000 17.3750
27 218.150       30.0551    
30 193.000 48.0000 36.0000 30.5000 26.5000 19.5000 14.5000
33 174.505       24.0420    
35 166.000 41.5000 31.0000 26.0000 23.0000 16.5000 12.5000
40 146.000 36.5000 27.5000 23.0000 20.0000 14.5000 11.0000
45 130.656       18.0008    
50 118.000 30.0000 22.5000 18.5000 16.5000 12.0000 8.8750
60 100.000 25.0000 19.0000 16.0000 14.0000 10.0000 7.5000
80 78.000 19.5000 14.5000 12.5000 11.0000 8.0000 5.8750
100 65.000 16.0000 12.0000 10.5000 9.0000 6.5000 4.8750
180 50.000 12.5000 9.5000 8.0000 7.0000 5.0000 3.7500
  36.000 9.0000 7.0000 5.5000 5.0000 3.5000 2.7500

Last Update: 9/29/98

Name: Drew Dubler

Email: drucifer@worldnet.att.net