The train is not responding to the remote.

I would repair the volume control motor driver circuit.
They often fail.

There will be something wrong with the remote sensor on the device itself. Maybe the LED has failed. The only other possible explanation is that it has a dual remote mode. And somehow it has been switched to that. Only a factory reset would cure that. But the question is can that be done without a remote? Though unless you have read in the manual that it has a dual remote mode I would go on the faulty sensor. First check that there is not something blocking the sensor!

Look for a small opening with little white tabs that can be moved up and down, on both the train and the remote. All the tabs must be in the same position. ( Same thing on a garage door opener.)
If that's not it, make sure the batteries are in correctly in both items, reversed batteries will run lites and such, but not remote controls.

ID say remote sensor.

the remote may havce bad battery connections? bad battries? be locked off? remove and replace battries. locate program switch on wall stat. temp set to energy saving mode. set out of temp set up-back mode to run in on-off-on mode non occupied

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You have to make sure the problem isn't with the remote. If you can borrow a remote or try to get a universal remote. If it responds at all then the problem was just your remote. that is a cheap annoying problem. If it still won't respond then it is a problem on the mainboard. It can be the infrared receiver or something else. If you can get a repair estimate that will tel you if it is worth fixing. You need to know what a replacement is worth and then add up all the costs for the repair ie shipping, repair bill, taxes etc. Even though the tv remote doesn't work the tv itself should continue to run just fine. You can put it on a cable box and then use the box to control channel and sound. That gets around buying a new tv and saves a few $$.

When you press a button on the RC, does a arrow appear in the top right corner of the RC?

Well, if the remote has any kind of function working the set I would say the set is ok. Try replacing the batteries, if that doesn't help, then run to your local retail discount store and grab a cheapo universal remote, program it and see. If that fails then in the shop it goes. ( I doubt it tho )

Just had this happen to me. It's caused by a failure of the power supply board. Replacing the power supply should fix this issue.

This appears to be a very comon problem.

http://www.reviewcentre.com/reviews110919.html

Cr1spy.

I have a new Philips tv that did the same thing on me I left it off for a couple of minutes and that seems to work