i have that highballer set with a F7a loco and i have a story to tell you guy.
so one day i was upset at this loco b\c it didnt draw enough power all of a sudden so i went through a checklist that are common Bmann probs. and i couldnt figure it out so like i said i was upset at it and i laid track up to my sink(i was sick and tired of the problems it gave me) and filled the sink up then i ran the train into the sink :o it was funny....but im not finished yet, two days later it ran wonderfully...and like a jack rabbit i might add, but the tap water didnt ruin a thing! a future commercial for Bachmann trains......... "Bachmann trains are Cheap and Indestructable!" it was fun really alot of fun ;D
Water usually don't destroy locos, as long as you dry them before running again.
Well, probably the water removed some dirt...
Anyway, remember electricity and water are a very bad mix.