. The Street railway journal . cision. Inthe cost per kilowatt installed the larger units always havethe advantage. When the attendance required is consid-ered, the larger units are also at an advantage, becausethe number of parts that must be looked after increases,of course, with the number of machines used. It is true, of course, that the use of large units would bedisadvantageous if they were run for any considerabletime under light loads. In a system like ours, however,the sub-station storage batteries can be charged or dis- ONE END OF THE COAL CONVEYING MACHINERY ABOVECOAL POCKET charged
. The Street railway journal . cision. Inthe cost per kilowatt installed the larger units always havethe advantage. When the attendance required is consid-ered, the larger units are also at an advantage, becausethe number of parts that must be looked after increases,of course, with the number of machines used. It is true, of course, that the use of large units would bedisadvantageous if they were run for any considerabletime under light loads. In a system like ours, however,the sub-station storage batteries can be charged or dis- ONE END OF THE COAL CONVEYING MACHINERY ABOVECOAL POCKET charged so as to help in keeping the output of our ma-chines always near their point of maximum efficiency. Asa matter of fact, at the present time we have two smalldirect-current generating stations which are run as re-quired so as to keep the units in operation at Ninety-SixthStreet always near their most economical load. In considering the question of one large polyphase sta-tion vs. two or more direct-current stations to supply a. October 5, 1901.] STREET RAILWAY JOURNAL. 411 large street railway system, it is urged by some that theliability of accident to one station is too great to admitsafely of putting all the eggs in one basket, or depend-ing solely on one station. For this reason it is advisable, ifone station only is employed, to take every precaution sothat trouble at one point will not disable the whole gen-erating or distributing outfit, and thus paralyze the wholesystem. In both our Ninety-Sixth Street station andKingsbridge station the arrangement of apparatus is suchthat there are practically several stations under one subdivision holds from the boiler room to the switch- usually occur at a manhole) will spread so as to damageand short circuit many other cables in the same this is not likely to happen with the precautionsand construction that experience has taught us to employ,it is still probably the weakest link in the chain. To elim-inate tr
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