*MRC Throttle Pack Model 501 HO Hobby Train Transformer By Model Rectifier Corp

MRC Model 501 Throttlepack HO Scale Model Train Railroad Control with Box

MRC Throttlepack Model 501 HO Train Transformer Controller USA Parts Repair

MRC Model 501 Throttlepack - HO Train Controller Hobby Transformer - Untested

Vintage MRC Throttlepack Model 501 HO Train Controller w/ Box & Manual TESTED

MRC Throttlepack HO Model Train Control 501

Vintage - MRC Throttlepack Model 501 HO Model Train Railroad - Control