Oh, I forgot about the quality of US infrastrure. If an engineer needs to make a voice call to communicate to unpower the line because a train has derailed, that's a systemic problem. I think all metros in the EU have telemetry and any major railway implements ETCS. Weird that "safety first" means that schoolkids cannot see the eclipse but public transport infrastructure gets way underfunded.
Also, a certain "blue line" keeps going off the rails in the US. I read this out of context and thought the police staged a riot.
I am not aware of any receipt printers using lasers - thermal printers have an array of resistors that get hot when necessary. I know how a laser printer works and it is hard to explain in 12 or so words. Inkjets are way easier, you can just say "squirt squirt oops". Anyway...