. Electric railway journal . per Car-Mile TABLE I—DATA RELATIVE TO PASSENGER LOADING AND ENERGYCONSUMPTION . Passeng ts per C ar-Mile . Kilowatt-Hours per Car-Mile Average Increase Average Increase^———. Year Average Per Cent Average Per Cent 1913 8. 18 1914 8 11 —0 07 —0 85 3 757 0 079 2 15 1915 8 09 — —0. 25 3 757 1916 + + 3 867 0. 110 2 93 1917 t0. 27 + 0 087 the period studied. As additional information relativeto the number and condition of cars, Table II has beenprepared. In 1916 and 1917, when increases in passenger load-ing amounted to 2
. Electric railway journal . per Car-Mile TABLE I—DATA RELATIVE TO PASSENGER LOADING AND ENERGYCONSUMPTION . Passeng ts per C ar-Mile . Kilowatt-Hours per Car-Mile Average Increase Average Increase^———. Year Average Per Cent Average Per Cent 1913 8. 18 1914 8 11 —0 07 —0 85 3 757 0 079 2 15 1915 8 09 — —0. 25 3 757 1916 + + 3 867 0. 110 2 93 1917 t0. 27 + 0 087 the period studied. As additional information relativeto the number and condition of cars, Table II has beenprepared. In 1916 and 1917, when increases in passenger load-ing amounted to per cent and per cent respec-tively, it will be seen that the pro-portions of total new cars, newclosed cars, and new open cars arein every instance greater than theincreases in passengers per car-mile. A fourth factor is the increasednumber of electric heaters in serv-ice. The yearly increases are herolisted. Increase in Electrically Year Heated Cars 1913 39 1914 139 1915 30 1916 126 1917 10 Total 344. JO 50 40 60 60 70Tempero+ure Deg. F FIG. 2 — RELATIONBETWEEN MEANTEMPERATUREAND ENERGY CON-SUMPTION The total number of electrically heated cars at pres-ent is 697. These heaters consume from to per car, that is, approximately from 10 to 20per cent of the power required to move the car overthe road, and account for a portion of the increased 0 58 4-4 if
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