I generally use MPEG Streamclip (which is free) to compress NL2 videos, and I use MP4 format (feel free to pick another). Generally I don't like to think of myself as a go-to guy for video related questions.
Did you use a video editing software? You could try to export your video with another format, maybe someone else know better than me which format you should use.
I can't believe you spent so much energy on uploading it to youtube XD. You make such beautiful coasters and parks, I'd love to see what you make when you aren't trolling the planet haha
^ Your most trimmed coaster makes sense to me because the brakes sound like those of a puffer train! xD Pretty funny idea! Way too slow Big Thunder Mountain-ish ride!