Robot Trains Season 3 Episode 10 Rust Rot

When the Rust Weevils swarm Railworld in their once-in-a-decade swarm, they infect the trains with horrible rust. That's what they do! Soon everyone is squeaking and seizing, and it's only a matter of time before they freeze up altogether! The Railwatch must find the mythical House of Oil, where they must bathe freeing themselves from the rust. Easier said than done!