I got a Bachmann EZ Command DCC controller just to test engines on my bench.
I got a little Bachmann trolly car, but it's only DC.
So I push F10 on the controller marked "for DC operation",
but when I put it on the track, the electric motor makes a weird high pitched drone sound,
kinda like a speaker getting shorted out.
The engine still runs, but I just want to make sure I'm not hurting anything.
I'll try to post a video showing what I'm talking about.