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The poor control on this game (matched only by the poor support from the devs) makes it difficult to select other routes, sometimes it's near impossible.
Find part of the route that's not being overlapped, put the cursor on it and them move the cursor along it (it should snap, sort of) to where you need to edit the route, you should then be able to select that route for editing.
Needs to be a route selector or something to make deleting the routes much easier. It really sucks when trying to tweak a route and end up deleting a diff route and end up having to reload, which I was I always save before attempting anything lol.