A Skarloey is a what you call a Old Red Narrow Gauge Tank Engine with three wheels and a cab.
Is Normally used when you see a Red Narrow Gauge Engine but don't know it's Plated Name or Number.
Is Sometimes A Common Nickname for the Pokémon Snorlax.
Version 1
Person 1: What Type Of Train Is That?
Person 2: Oh That's A Skarloey
Version 2:
Mum Or Dad: What's that Snorlax's name?
Child/Teen: His name is Skarloey