How to Delete Routes?

I am running Trainz2006 on a pretty good laptop but want to conserve space. Does anyone know how to delete routes that came this Trainz2006? I only use the US routes plus a few that I have downloaded. The routes that came with Trainz2006 use a lot of unnecessary space that would be nice to recover. Anyone know how to delete these unused routes?

I don't believe there is a way...I have tried to delete unused default content but it won't let me because it's built-in...if there is a way, somebody needs to let me know, too!

Tim

You can't delete built-in routes because of how they are saved in file format. Same for default content. You can only disable it so you don't see it in Trainz.