How do you undo while constructing roller coasters?

I messed up with a track and couldn't find an undo/erase feature anywhere. The only solution seems to be to delete the entire thing and start all over again. i know I'm missing something here, but what?

Thank you for those who will be kind enough to enlighten me.

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aarrgh. found it, thinking that all this time it's for something else. thanks, anyway, guys.

Very easy. Just click on the Track Trash Bin in the edit section (see pic). You can select any part of your track and remove just that part by ckicking the Track Trash Bin.

   

Just click the trash can button to delete your section of track.

Really, there isn't an undo button in RCT3, so you should have at least looked at a tutorial.

Well "undo" as is delete.

Well "undo" as is delete.

If you want to say that...