The narrow-gauge steam locomotive, despite its size, is the most remarkable vehicle on land. And the engines of the Ponyville Narrow-Gauge Railway are the power behind the industries and sightseeing that make up their beautiful line. This, is “Narrow Gauge Engines”!

[embed]https://www.youtube.com/watch?v=foRLd1kuxRo[/embed]

Based on the Railway Series by the Reverend Wilbert Awdry, and other stories which reimagine the MLP characters as steam locomotives.

With thanks to Sonicfan117DASH for the description.