. Electric railway journal . U 7 9,37 Mtetrlt Rj-Jauraal Fig. -Temperature and Root-Mean-Square Readings for Runs with Motor Car Only 8 9 1011 12 1 Time 7 8 9 10 Electric Fig. i—Passengers per Trip of anInterurban Line 2 3 4 5 6 1 8 9 10 11 12 131 14 15 16 17 18 19 20 21 22 23 24 -— t-Mlectnc Fig. 3—Temperature and Root-Mean-Square Readings for Same Runs as Shown in Fig. 2, but with Trail
. Electric railway journal . U 7 9,37 Mtetrlt Rj-Jauraal Fig. -Temperature and Root-Mean-Square Readings for Runs with Motor Car Only 8 9 1011 12 1 Time 7 8 9 10 Electric Fig. i—Passengers per Trip of anInterurban Line 2 3 4 5 6 1 8 9 10 11 12 131 14 15 16 17 18 19 20 21 22 23 24 -— t-Mlectnc Fig. 3—Temperature and Root-Mean-Square Readings for Same Runs as Shown in Fig. 2, but with Trailer the combination of a motor car and a trailer. In obtainingextra seating capacity by the use of trailers many peopleseem to feel that they are, as it were, putting one overon their motor equipments and obtaining extra work outof them without their knowing it. In fact, some evenseem to believe that just as the work of the motorman isnot materially increased by the addition of a trailer, so thework of the motors likewise remains the same. This, how-ever, is far from the fact. It is true that the power takenby a motor car when running at constant speed on leveltrack is increas
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