This is Model Railroader Magazine August 1973 Uncoupling Ramps
Contents: Bunn's Feed and Seed Plant, Santa Fe 4 6 4, How to Make Neat Signs, Bay Point & Clayton Valley RR, Jog in the Track, Roving Uncoupling Ramps, Dayton & Western RR, Dual Polarized Feeder Wiring, Op Detection Circuit
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