Big Thunder Mountain Railroad (or for short Big Thunder Mountain) is an indoor/outdoor mine train roller coaster located in Frontierland at several Magic Kingdom-style Disney theme parks worldwide. The ride exists at Disneyland Park (Anaheim) and the Magic Kingdom at Walt Disney World as Big Thunder Mountain Railroad, and at Tokyo Disneyland and Disneyland Park (Paris) as Big Thunder Mountain. Big Thunder Mountain Railroad is also the name of the fictional rail line the roller coaster depicts. For more info click the link below.

http://en.wikipedia.org/wiki/Big_Thun...