. Electric railway journal . 20 30 40 50 60 0 10 20 30 40 50 60 060 MIN. HEADWAY, 39,420 MILES PER YEAR ICar 20 30 40 50 60. 20 30 40 20 30 40 20 30 40 !Cars !Cars 50 60 0 10 EO 30 40 50 60 030 MIN. HEADWAY, 78,840 MILES PER YEAR 20 30 40 60 / / ZGars\ k»rs\ 50 60 0 10 20 30 40 50 60 020 MIN. HEADWAY, 118,260 MILES PER YEAR 20 30 40 ^ars x 50 60 0 10 20 30 40 50 60 015 MIN. HEADWAY, 157,360 MILES PER YEAR 20 30 40 / \4 Cars / \ .Car\ 50 60 o 10 20 30 40 50 60 10 MIN. HEADWAY, 236,520 MILES PER YEAR

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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp