i just purchased the Royal Gorge trainset. i plan to expand the layout to roughly 15 feet by 15 feet by purchasing additional track sections. Will the power pack that comes with the set be strong enough to make the train go ?)
If it's strong enough to make the train go on the track that came with the set, the answer is yes. Track isn't all that great an electrical conductor, with all the joints involved. So the trick is to add additional power feeders from the powerpack to various points along the track to even out the electrical distribution.
For a 15 x 15 layout I would use a minimum of 4 feeders spaced evenly around the track. More feeders would be better, but anything more than 1 feeder 3 or 4 feet would be overkill.
Len