Robot Trains (2015)

S1E28 All for One and One for All

The group successfully arrives at Victor's Base, where Selly works on mending Victor while linking his engine to Kay’s. At the same time, Duck enjoys skating across a frozen lake, only to be startled as the ice unexpectedly melts and the water disappears! Meanwhile, Alf and Duke investigate the mysterious phenomenon and set off to uncover its origin.