I am new to trains and need help. I received the Hawthorne village NFL theme train and ez track complete with power pac. It has 18 cars the loco appears to be strong enough to pull them but as it gets to the opposite side of the layout it comes to a crawl. Do i need a bigger power pac. Are 18 too muck for one loco, can I use two loco's at once on same train. Sorry for all the questions I am a novice who wants to show off for his kids. thanks for any help or advice