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Rusty is suspicious of a strange boulder lodged in the mountains. A new machine called Thumper comes to work and causes chaos when he dislodges the boulder and it lets loose on the railway.
Duncan teases Peter Sam after some trucks fall into a ravine, so Rusty tells Duncan a ghost story to make him eat his own words. Duncan later has to cross the same ravine.
Thomas is cross with the snow, so Rusty tells him about Skarloey's own experience. His crew had stopped on the line to have some cocoa, but some slate trucks run through the buffers and into the ravine, causing an avalanche.