There is a pulley and weight visible on the left-most catenary pole in the photo above by rohr turbo. Typically an motor's roof is too busy for monitoring gear, but SEPTA and AMTRAK have no issues placing the equipment on an 85ft long roof of a coach, in revenue service or otherwise.
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Avatar: An overnight trip on Girard Ave. stumbles upon 6 PCC's and an LRV stuck within two blocks.
Avatar: An overnight trip on Girard Ave. stumbles upon 6 PCC's and an LRV stuck within two blocks.