Quote:
Originally Posted by worth
Something I've often wondered is the buzzing that is very evident in the first video and during breaking in the second video. I'm sure someone know what this is. I always though it happened while braking bit it also seems like it is happening while the train is accelerating in the first video.
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Quote:
Originally Posted by frinkprof
^This is regenerative braking. Some of the energy that is created (which would otherwise be lost) while braking is fed back into the electrical system. In the first video, the operator is riding the brakes down the incline of Bow Trail eastbound.
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I'm not sure if it is fed back into the grid or not. The traction motors do generate current during this (); on regular freight locomotives when they do dynamic (or regenerative) braking this energy is dissipated through very large resistor grids, which contain large fans to cool them. When you are watching the CP trains come down the hill near the Spiral Tunnels, the fans are primarily what you hear. Perhaps the new C-Trains have a system on board where batteries temporarily store the energy created through dynamic braking, similar to a KERS system.