Hi I am working on a project to mount a wireless camera onto an old train carrage. I want to use the power from the tracks to power the camera. The tracks are DCC and 15V so I have built a rectifier circuit and added a voltage regulator and everything works until the trian moves. When the train moves the camera goes off. It seems to be where the power is picked up by a small metal bush that rubs against the wheels, as the wheel turns it causes the current to flicker. Does anyone have any ideas on how i can over come this? I was think of something like a capacitor to supply power in the short time the power drops??? Any thoughts?