The Narrow Gauge Engines were awesome  engines that take place in many areas even the Skarloey Railway. And it’s also cool that most episodes of Season 4 of Thomas & Friends until Thomas & Stepney we’re it focused more on The Narrow Gauge Engines rather than the normal engines, and that goes for other Seasons and episodes too like Duncan gets Spooked, Dunkin Duncan, Rusty Saves The Day, Faulty Whistles, The Old Bridge, Rhineas & The Roller Coaster, The Runaway Elephant, Mountain Marvel, Don’t Bother Victor, etc. I think The Narrow Gauge Engines deserve a Spin-Off to focus even more on the Narrow Gauge Engines!