Right. Plus how often is an entire line backed up because the operator didn't crawl slowly enough past that misconfigured signal, so the emergency brake got tr

Right. Plus how often is an entire line backed up because the operator didn't crawl slowly enough past that misconfigured signal, so the emergency brake got triggered and additional action had to be taken to get the train moving again (release from dispatch? crew sent out?), causing thousands of people systemwide to be "delayed because of a signal problem at 14th St" or whatever?