Originally Posted by TGP:
Very limited info, but it is exact for you: as I have just acquired exactly the 12938.
Run total conventional, and currently have this transf. running,
MTH - Penn Central e44, N-8 Caboose, hooked to NH e33, and a 12 scale
cylindrical hopper consist. Just fine !!
This transformer can have issues with MTH PS1 and some other engines that have QSI systems in them. The transformer controller puts out a chopped sine wave that causes the horn or whistle to blow constantly and the engines shut down. With MTH PS2 engines the sound systems shut down but the engines operate.