Episode 1 was made from Leokimvideo. He used Ertl models and modified wheels that before was hard to use on the tracks that didn't run well enough and pull with a string that can make the engines move around.
All of the characters were given new names except for Thomas and the fat controller.
It was so popular that the first episode was made before a re-release was made with extended scenes that weren't in before the original was taken down the original one was over nine minutes ago as the remastered version was 11 minutes only for some hype over Episode 2 that never was release to this very day everyone had make theories surrounding it,
Here's couple of behind-the-scenes videos that leo explain before. As well making episode 2 and release the trailers in April.
Episode 2 and 3
Fans would ask Leo why was episode 2 never release with questions is it on hiates now or leo taking some time. This would only be about 3 years when leo explain why episode 2 was never released along with episode 3 was too not released. With the episode that was over 75% that the scenes was made but likely due with Hit hitting leo with copyright and along with fans that left negative responses claiming his take on Thomas is unoriginal.
I'm not gonna give out much of the spoilers but i think the video can tell who really was the mad bomber.