Ivatt Class 2 2-6-0 locomotive
I used a LEGO Powered Up motor and the associated battery box. I bought the Powered Up cargo train several years ago, on a whim and at a discount, and still hadn't opened the box. The battery box is clunky, so it wasn't easy to incorporate into the tender, but it fits. There are two removable panels: one covering the on-off switch and one that facilitates removing the battery box from the tender in order to swap batteries.
Ivatt Class 2 2-6-0 locomotive
I used a LEGO Powered Up motor and the associated battery box. I bought the Powered Up cargo train several years ago, on a whim and at a discount, and still hadn't opened the box. The battery box is clunky, so it wasn't easy to incorporate into the tender, but it fits. There are two removable panels: one covering the on-off switch and one that facilitates removing the battery box from the tender in order to swap batteries.