Would you ride the L if you knew the CTA's diagnostic equipment was held together with duct tape?
"Go to Home Depot, get a laser level/measurement device ($149), duct tape ($6) it to a Roomba ($300) that's been modified to run on one set of tracks with some 2x4's and casters ($10) and then duct tape an iphone to the top of the Roomba with a GPS app and another app that sends back the distance between tracks (the gage) to a central office. Any highschool geek could whip it up for pizza money. Total cost? Probably less than $1,000."
Until it doesn't work, and the CTA shucks out billions in class-action lawsuits. People are starting to get weird.