If the wire is cloth covered, Lionel used #22 or #24 pushback wire postwar until they went with vinyl, maybe early 1950s. It is solid wire making connections much easier to male than with stranded. With push back wire the insulation is just slid back, not stripped. After the connection is made, the insulation is just slid back into place reinsulating the connection. Reproduction push back wire is available from several of the parts vendors, including The Train Tender. Comes in several colors. There is also super flex push back wire that I use on box couplers.
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