Snow had collected on the conductor rails on the piccadilly line this
morning (presumably Tubelines were still asleep since arn't they
supposed to clear them?). Anyway , the shoes were sparking nicely and
the lights and other systems were going on and off. Does constant on/
off of the juice do the train systems any harm in the same way
constantly flicking a PC on/off would eventually kill it? Am I right
in suspecting this will probably affect the newer trains with
electronic control systems more than the old electro mechanical ones?

B2003