Thanks so much guys. I've got a lot to do and check - thanks to your help and input.

Here is the train I have:

https://a.co/d/9DZFh6l

I'm not sure if that link will work, if not, it's the Bachmann Night Before Christmas Ready to Run G Scale.

I bought extra Bachmann track, same as what came with the set. Some of what I purchased was used - maybe that wasn't a good idea?

As far as the radius - the track support has already been built and installed into the wall, so changing the track with new radius won't work.

I'll look into getting a more powerful transformer. Anyone have any specific recommendations for a 60' track G scale train? If not I'll head over to mylargescale and see what they think.

Thanks so much for your help!

Thanks for your reply. Yes, I've read that I need to maintain the track and engine. But, this is a brand new set up, just one month old. Should this have happened in that short of a time? Do you think I should purchase a more powerful transformer?

Hello - first time poster here.
I own a Christmas store (open all year) and we recently installed a G scale Bachmann train to run around the store, near the ceiling. I only had it running every once in a while, maybe once an hour for 5 mins (there's an on/off switch on the desk). It's about 60 ft of track in an oval. I didn't do much besides purchase the train and extra track- we had a carpenter build the platform and he then got the train running.
 It worked perfectly for the first month but then it stopped. I was able to get it going by turning it to max speed and physically pushing the train to get it started but this is obviously not sustainable.
Our carpenter said he thinks it's probably the transformer - that the transformer which came with the train is not appropriate for a 60' track and thus not strong enough.
Does this sound right to you? If so, which transformer should I be looking to purchase?
Or, do you think it's something else?
Any and all help would be greatly appreciated. Thank you!