Got my daughter a Kalamazoo 4-4-0 for her 1st Christmas back in 1884 (flatcar, gondola, & caboose).
Have been running it with a MRC Tech II throttle since 85; even using a Bachmann storage building with whistle as an accessory.
Late 80s added two passenger cars and LGB track and turn outs to the original loop of track.
This year I bought my daughter’s daughter a Lionel battery powered ready to run Thomas the Tank set ( www.lionelstore.com/Thomas-F...Set?quantity=1 ) with LionChief Blue Tooth remote control.
Wow! She loves it and can easily operate it herself (3yrs old).