. American engineer and railroad journal . Length op Gaaoe r/v thousaho Feet No. 3—Tonnage bating Diagram. 8 an»(,. ... Engine Loadihc. If MILE!. PER & y. AH0 Feet At A No. 4.—Tonnage Rating Diagram. any modern engine on any profile and alignment, and few calculations to establish a satisfactory Force of Locomotives. The tractive force referred to in this article will be that avail-able at the circumference of the drivers, and will be designatedby T, and is determined as follows: At slow speeeds, 5 to 8 miles an hour, with the reverse leverin the
. American engineer and railroad journal . Length op Gaaoe r/v thousaho Feet No. 3—Tonnage bating Diagram. 8 an»(,. ... Engine Loadihc. If MILE!. PER & y. AH0 Feet At A No. 4.—Tonnage Rating Diagram. any modern engine on any profile and alignment, and few calculations to establish a satisfactory Force of Locomotives. The tractive force referred to in this article will be that avail-able at the circumference of the drivers, and will be designatedby T, and is determined as follows: At slow speeeds, 5 to 8 miles an hour, with the reverse leverin the corner notch and a cut-off of about 90 per cent, of thsstroke, pressures will be obtained about as follows: Initial pressure =.95 boiler pressure. Mean effective pressure =.91 initial pressure. Mean effective pressure =.86 boiler pressure. Allowing 8 per cent, internal friction =.92 Mean available pressure =.80 boiler pressure. August, i!)oi. AMERICAN ENGINEER AND RAILROAD JOURNAL. 263 This allows for friction of pistons, valves, eccentrics, etc, butnot the resistance lo motion which must be considered \\illithe train. For the maximum available
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