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| Re: PCC and other Trolley Question????? (1180921) | |||
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Re: PCC and other Trolley Question????? |
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Posted by Joe on Sat Oct 13 05:59:34 2012, in response to Re: PCC and other Trolley Question?????, posted by RockParkMan on Fri Oct 12 19:23:38 2012. To: RockParkManYes, there are some important differences, and there are differences by choice of the designer. 1) Overhead trolley wire needs frogs. The forward motion of the car will tug the pole onto the correct choice. Because a pantograph has a wide blade, one can begin the diverting route with a wire that does not physically meet the straight route. 2) Only opinion: In the U.S., light rail catenary is too heavy, too complex, making for intrusive visual clutter over the street. Some of the European systems with pantographs have simpler catenary that comes a bit closer to the early 1900's hanging of trolley wire. 3) I cannot describe the difference in tension between the ways of hanging wire over streets. In The Bronx, the wire seemed to be hung easily and loosely, but more carefully on curves. |
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