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Just to expand on what Arthur says,you can use a light duty micro switch to power a relay coil,then have the relay contacts power one or more circuits carrying heavier amperage. Using timer modules and more relays you could even automate the bridge. This way you can get away with a very light spring for the micro switch..

Dale H
Thank you for the response, however I must not have asked the question clearly.

I use micro switches to protect the track on either side of the bridge. That is not my area of concern.

My concern is to power the locomotive while it is on the bridge.

I have been using spring clips somewhat like the contacts between MTH sectional tracks to provide electrical power to the actual bridge rails.

Need to supply electricty to the bridge track.
What I did with my lionel track was have 3 track pins sticking out on the table ends and on the bridge tracks cut the bottom off and shape it U shaped. So the bridge has U U U facing down to track pins o o o been using this for 15 years train never lost power weight of train see's to that. Very simple saw this in old Popular Mech. mag. from the 50's.
The 3 U U U form a plugin type connection with the 3 o o o track pins.
TEETEE:

The nice thing about copper or bronze blades and mating sockets from knife switches is that they use a concept called "wiping" which simply means that the clean themselves off every time they come together. Technically, they exhibit a concept known as "contact follow" which means that there is a bit of springiness (as you pointed out in your invention) that ensures that the mating surfaces bend a little when mated. This helps the wiping action.
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