power pickup for caboose trucks?

thomasmclae
 

I need power pickup for a caboose project.
I saw somewhere an 'H' shaped brass part that would wipe against the axles of a truck. I cannot remember where I saw this.
(Maerklin has these in the conversion kits for passenger cars, but only one per kit, and that is too costly!)

Anyone know who makes these?

Thomas

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