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

Number of division.	Maximum grades.	Designation of parts.	Order 1 50 tons.	Order 2 100 tons.	Order 3 250 tons.	Order 4 500 tons.	Order 5 750 tons.	Order 6 1,000 tons.
1	Level.	Grate area. Tube surface. Cylinders. Wheels. Weight.
2	10 feet per mile.
3	20 feet per mile.
4	40 feet per mile.
5	60 feet per mile.
6	80 feet per mile.
7	100 feet per mile.

The speed is assumed from twelve to fifteen miles per hour. The mean cylinder pressure is assumed at sixty lbs. per square inch; the initial pressure at ninety pounds, and the boiler pressure at 120 lbs. per square inch. The grate areas are designed for coke; for wood multiply the same by 1.4.

365. Department 2. Passenger.

Classification.		Order 1 50 tons.	Order 2 100 tons.	Order 3 150 tons.	Order 4 200 tons.	Designation of parts.
Division 1 Level.	25 miles per hour.					Grate area. Tube surface. Cylinders. Wheels. Weight.
Division 2 20′ grades.	25 miles per hour.
Division 3 40′ grades.	25 miles per hour.
Division 4 60′ grades.	25 miles per hour.
Division 5 80′ grades.	25 miles per hour.
Division 6 100′ grades.	25 miles per hour.

The engines in the Northern States require more power in winter than in summer.

To the above classification might be added, an engine for “making up trains,” and similar station work; such an engine should be able to start easily the extreme weights of trains, from fifty to one thousand tons, and should be fitted with a power of varying its adhesion.

FORMULA.

W × [V²
171 + 8] = R.

Example.

The speed being thirty miles per hour, and load 250 tons.