Mth 4012 ps1 where is the battery?

Check the tender.

In the tender with the PS1 board https://www.mthpartsandsales.c...lists/186?type=lists

Jim is right.  Here's a link to the MTH parts list and diagram: Premier Big Boy PS-1

In case you don't have it, here's a link to the 20-3021-1 manual.

EDIT: I see Vernon was quicker than me with a diagram, oddly they're different.

@SteveH posted:

Jim is right.  Here's a link to the MTH parts list and diagram: Premier Big Boy PS-1

In case you don't have it, here's a link to the 20-3021-1 manual.

EDIT: I see Vernon was quicker than me with a diagram, oddly they're different.

I grabbed the railking not realizing it was premier.

That said- plot twist- I personally serviced this engine. He just purchased it from a club member and that club member paid me to service- so it had supercaps already.

In fact, it's got new tires, repacked smoke unit with new wick, lubed every point, checked all lights. Solid used engine.

Plot twist #2 I thought i was buying a railking and he shows up with the premier..plot twist #3 I have to re do the layout for bigger curves.