I'm new to model train building, and am working on my first layout. I have an oval of track layed out, with a few switches that just lead to dead end side tracks. I have a big problem, though.. my train will not run. I connect my power pack to the track using terminal rail connecters, attached to the end of one of the side tracks. When I place my locomotive at the end of the track, very near the terminal connecters, and turn up the power, the train nudges a few inches and dies. Again, this is my first try with a train set and I probably made a very newbie-esque mistake. Thanks in advance!