Silver

Bio
Silver was an engine, featured in a story that BoCo told Skarloey. Silver was the fastest engine in the hills. He was shiny and fast, and always boasted to the other engines. However, Silver soon got his punishment when a wizard put a magic spell on him, turning Silver into a rusty slow engine. Since then, he became the laughing stock of the other engines and was called Tramp.

Basis
It is unknown what type of engine Silver/Tramp is because he was only mentioned in the 'Thomas & Friends' magazine story "The Magic Spell", which only had an illustration of BoCo and Skarloey.

Presumbly, Silver/Tramp is a narrow gauge tank engine, as he was decribed as being the fastest engine like Freddie.

Appearances
Silver/Tramp was only mentioned in BoCo's story in the 'Thomas & Friends' magazine story "The Magic Spell".