The max track length can be extended by reducing the amount of turnouts/branches created. The limit is there to allow people on lower end computers to play the map without too much lagging, visual popping (tracks visually disappearing when there's too many on screen), and to keep filesizes/transfers limited.

Can you tell me about what kind of map you're making?

The tracks and props visually disappear on this map I'm working on, as well as many others I've played on from online servers and the workshop alike. I'm making a multi-level mountain loop railroad. Would it be beneficial if I were to record some of the glitches I experience then upload them to YouTube so you can see?