Handbook of Railroad Construction; For the use of American engineers. / Containing the necessary rules, tables, and formulæ for the location, construction, equipment, and management of railroads, as built in the United States.

by George L. Vose

R will be [(30 × 30)
171 + 8] × 250 = 3315 lbs.

366. Table 1. Showing the required traction on a level for loads from fifty to one thousand tons, and for velocities from ten to one hundred miles per hour.

Velocity.	50 Tons.	75 Tons.	100 Tons.	250 Tons.	500 Tons.	750 Tons.	1000 Tons.
10	429	643	858	2146	4292	6435	8585
12	442	663	884	2210	4421	6630	8842
15	465	698	931	2328	4657	6982	9315
20	517	773	1034	2585	5170	7735
25	582	874	1165	2912	5825
30	663	994	1326	3315	6630
40	868	1302	1736	4340
50	1131	1696	2262	5655
60	1452	2180	2905
100	3324	4986	6648

FORMULA.

WR
L.

Example.

The tractive power to overcome the resistance of 750 tons upon a sixty feet grade is

750 × 60
5280 = 19050.

367. Table 2. Showing the tractive power necessary to overcome grades from ten to one hundred feet per mile with loads from one to one thousand tons.

Grade.	1 Ton.	50 Tons.	75 Tons.	100 Tons.	250 Tons.	500 Tons.	750 Tons.	1000 Tons.	Grade.
10	4	212	318	424	1061	2121	3181	4240	10
20	8	424	636	848	2122	4242	6362	8480	20
30	13	636	955	1273	3170	6363	9545	12730	30
40	16	848	1272	1696	4244	8484	12724	16960	40
50	20	1060	1590	2120	5305	10605	15905	21200	50
60	26	1272	1910	2546	6340	12726	19050	25460	60
70	30	1500	2240	3000	7500	15000	22400	30000	70
80	33	1697	2545	3393	8489	16969	25459	33950	80
100	40	2120	3180	4240	10610	21210	31810	42400	100
Grade.	1 Ton.	50 Tons.	75 Tons.	100 Tons.	250 Tons.	500 Tons.	750 Tons.	1000 Tons.	Grade.