TWENTY FIVE HO scale Federal Signal 372 Commander beacons, perfect for all locomotive cabs.
Simply soak in Bestine overnight to remove waxy residue and either drill a 1.1mm (0.045") hole to mount or cut flush with base and glue in place.
Shout out to the Modular Railroading channel on how to make these operational:
https://www.youtube.com/watch?v=gqLFv_QBagg