Sterling Model M and Federal Signal STH-10 - Sterling was replaced by the STH since at least ‘98, back then the Sterling was “still hooked up, but we were using another one,” which the other one is the STH. STH broke years ago, “Speculation was a blown fuse up top.” In late April of 2026 they took down the Sterling, which I bought off them, and in the process of restoring. It cannot be run with the 8 port rotor, as that is cracked and missing a port. Submitted by Colton R. (The Railcat).