. Electric railway journal . to the statistics of the two other large railroads thathave been bringing traffic into the city for many train sheets and load curves were worked up large-ly on this basis, due allowance being made for futuregrowth. The train weights and some of the other data as-sumed are given in the accompanying table. Portionsof the calculated daily load curves are shown in Fig. 6. Train Weights and Speeds Assumed for Montreal Terminal,Electrification Trailing Speed per Cent Class Toils Level Up Grade Schedul 1130 One motor coach 60 5
. Electric railway journal . to the statistics of the two other large railroads thathave been bringing traffic into the city for many train sheets and load curves were worked up large-ly on this basis, due allowance being made for futuregrowth. The train weights and some of the other data as-sumed are given in the accompanying table. Portionsof the calculated daily load curves are shown in Fig. 6. Train Weights and Speeds Assumed for Montreal Terminal,Electrification Trailing Speed per Cent Class Toils Level Up Grade Schedul 1130 One motor coach 60 Three motor coaches 180 Three motor coaches ami two trail coaches 260 Freight 1000 Four systems of electrification were considered:Three-phase, 3300-volt to 6600-volt , 11,000-volt Fig. 4—Montreal Tunnel—Typical Tunnel Section in Hard Rock other alternating-current systems, the economy of trans-formation by means of stationary transformers insteadof rotating machinery. In this case, however, the first of these advantagesdid not apply, as the maximum grade throughout thewhole of the electric zone is only per cent. As re-gards the last advantage, it was expected that elec-tric energy would be purchased rather than generatedby the railroad company, and as all the available powerin Montreal was at sixty cycles, whereas fifteen cyclesor twenty-five cycles is required for this system, rotat-ing machinery in the shape of frequency changerswould have been necessary. This, of course, would haveeliminated the greater economy of transformation thatthis system claims over direct current. The chief disadvantages of this system appearedto be: Necessity for two trolley wires and two collectors in-sulated from each other. Complicated and inefficient speed control. KALEV
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