. Electric railway journal . 175 10 15 20 25 30Time in Seconds 150 o!25 i 100 Q_E < 50 r- 3530 i 125 Length of Stop in SecondsCoosting-%of ]/2S7 per Car Mile~ Coasting% Decrease in Power 0472 \\2/.30\ of Run 1056FeetCoasting Rate 20 30 40 SO 60 70Time in Seconds 80 Fig. 4—Speed-Time and Power-Time Graphs for Several Durations of Stop January 15, 1916] ELECTRIC RAILWAY JOURNAL 117 Fundamental Principles of Car Operation Efficiency A Study of the Practical and Technical Principles Involved in the


. Electric railway journal . 175 10 15 20 25 30Time in Seconds 150 o!25 i 100 Q_E < 50 r- 3530 i 125 Length of Stop in SecondsCoosting-%of ]/2S7 per Car Mile~ Coasting% Decrease in Power 0472 \\2/.30\ of Run 1056FeetCoasting Rate 20 30 40 SO 60 70Time in Seconds 80 Fig. 4—Speed-Time and Power-Time Graphs for Several Durations of Stop January 15, 1916] ELECTRIC RAILWAY JOURNAL 117 Fundamental Principles of Car Operation Efficiency A Study of the Practical and Technical Principles Involved in the Use of the Time-ElementFactors in Railway Operation, Particularly in Determining the Most Economical Rates ofAcceleration, Braking and Speed from the Standpoint of Power and Platform Costs By C. C. CHAPPELLE Consulting Engineer and Vice-President Railway Improvement Company EVERY traction company executive and his operatingstaff are confronted with the necessity for increasedeconomies in operation on account of the greater costof money needed to meet the constant demand for newcapital, and because the general business depressionand the competition of the automobile tend to curtailgross earnings. Obviously, increases in gross earningsare not to be expected under conditions generallyexisting. In searching for means of r


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