The Big Dipper (bridge)

The Big Dipper is a large two-track viaduct made of stone. When Mr. Conductor was captured by Diesel 10, he discovered that the bridge had begun to collapse as a result of the world losing its energy, caused by his gold dust crisis. Diesel 10 fell into the river below after failing to jump the gap when in pursuit of Thomas and Lady. It's unknown if it was repaired afterwards.

It's not to be confused with the Viaduct or the one mentioned in Haunted Henry.

Trivia

 * The bridge was only called "The Big Dipper" in the original Thomas and the Magic Railroad script.
 * It was only seen in Thomas and the Magic Railroad.