Can be installed into many locomotives to provide sounds

Model Number: 92-037

This is a Rapido Trains 22501 HO Scale Baltimore & Ohio 1956 Scheme Alco FB-2 Diesel Locomotive w/ DC/DCC/Sound #803-X

Model Number: 949-2464

the fixed voltage plug

MTH 70-3021-1 Undecorated G Scale J3a 4-6-4 Steam Loco w/PS2 ProductID_11379407 Can be installed into manyHere is an MTH 70 3021 1 4 6 4 J3a Hudson Steam Engine w Proto Sound 2. 0 (Unlettered). Features: Detailed weather resistant polycarbonate boiler and tender body Weather resistant, Authentic Paint Scheme Indoor Outdoor Use Metal Wheels and Axles Supplied with operating Proto Coupler, hook & loop coupler, and drilled mounting pad for Kadee coupler Lighted Number Boards Constant Voltage Locomotive Headlight Precision Flywheel Equipped Motor Engineer and