Thomas & Friends S04E21 - Bulls Eyes

Based on the story of the same name from Branch Line Engines.

Daisy teases Toby about his cowcatchers and side-plates. Toby tells her they are for stopping him from hurting animals if they stray on the line, but she claims that she would simply have to "toot" to scare them off. However, when she comes across a bull she realises that it will need more than a command to move it away.