Big Thunder Mountain Railroad is a landmark attraction released with the Jungle Book Part 2 Update on 20th September 2017. It is unlocked during the What's Mine Is Yours quest. It is the centerpiece attraction of Frontierland.
Big Thunder Mountain is a classic mine train roller coaster located in Frontierland in many of the Disney Parks worldwide. Guests are introduced to an abandoned mining town, where the mining trains still seem to run amok with nobody driving them. The ride itself weaves guests in and out of the unstable rocks, with the constant fear that the tunnels would collapse by the rumbling of the trains or by leftover dynamite.