"Increase priority" thing

[Jafar_the_Barmecide]

My big problem with this was building rail. There is no way to pause rail tracks and no way to stop them being built once they are placed until they are finished. They will ignore all other priorities until the rail track has been laid down. I laid down 2 years worth of work (because I was planning the town around the rail) before I realised I could not stop the building or correct mistakes until the track laid was finished. Live and learn.