@SteveH posted:JackO, you're welcome. I'm glad you found this information helpful.
To further help others with this topic by way of transformer comparison, would you please consider posting the Current Output rating in mA (or Amps) of your wall transformer and also the set number it came with (ie. :6-xxxxx) ?
The Polar Express Set was 6-84328, purchased late 2017. It came with a 54 Watt power supply. (3000mA x 18v DC)
See attached photos. We have not had any issues with it, with the significant additions we've powered with it.
The power supply is fast acting, in my opinion, and resets quickly. This has been tested (unfortunately) A LOT and we have not noticed any adverse affects yet.