I have power to the track and the controller, but not the train.

I assume you have the Treetop Tender car on the track? The treetop tender is car that makes the electrical connection between the track and the train.

1. Use a volt meter across the track. You should have about 10.5VDC on the track (anywhere on the track)
2. Even without the Loco on the track, the Treetop Tender should light up if you have power to the track. If you have power and the tender does not light. Check the brushes located between the wheels on the tender. These are the motor brushes that pick up the current from the track for the train set. Make sure they are contacting the track.
3. Add the loco to the track and plug in the large black plug from the tender to the loco. Turn on the power and press forward. The train should start rolling.

Try all the functions, bells, ho ho ho, all aboard etc ..

Add one car at a time and make sure that each one lights up before moving on to the next.