Neil is an old tank engine who worked on the Sodor and Mainland Railway.
Neil is a simple but kind engine who befriended Skarloey when he was young.
- Neil's prototype features a thinner face, a slightly smaller chassis, and brighter "S & M 2" lettering on his tank.
- Neil is depicted with a dome, despite not having one in his appearances. This feature possibly represents his safety valve.
- Neil's funnel is wooden, despite all other vehicles at the time having plastic ones.