Besides all that and the typical "help me post" product number, since it was an MTH product and technical support, really should have gone into an MTH category.
Not only that, we also need an understanding of the track layout and power source. Example is this a set that came with an IR commander, and then of course the engine would sit there silent until commanded to do something via the IR commander remote?
VS VS
And entirely possible the breaker is tripped on the power brick?
Must be pressed in and not showing the white tab when tripped.
PS-3 loco? I bought it for a gift back back in 2012. The family only puts it up around the tree each Christmas. He went to set it up this year and loco would not move.
Again, #1 product number. Most likely a Railking set 30-XXXX-1