An electricalroblem with Holiday Express train

This train set is very particular and getting it to work each Christmas is a family tradition in frustration. First you must make sure that all the pieces of track are connected properly and that the track is perfectly symmetrical and flat. We double-check the battery positions every year and find one in wrong. There are + and - signs, but they're hard to see; use a flashlight. There is a black toggle switch below and behind the red stack that toggles forward (to make the train go forward) and backwards (reverse); straight out perpendicular to the train is the "stop" position. Also, you have to start at a stop/switch station. One other note: behind the red stack, there is a smaller black stack. If you turn this, you can make smoke come out of the stack. I think I remember someone suggesting a drop of cooking oil. Hope this helps!!! Hope you get it set up for Christmas!!!