I'm building a mod for the game Subway Builder (http://subwaybuilder.com http://subwaybuilder.com) that lets me undo/redo individual stations and tracks, instea

I'm building a mod for the game Subway Builder (http://subwaybuilder.com http://subwaybuilder.com) that lets me undo/redo individual stations and tracks, instead of clearing all blueprints.