MTA knocked together a system that was comparatively half-baked. It is not wired into the mechanical signals, nor does it control the switches or link up to the

MTA knocked together a system that was comparatively half-baked. It is not wired into the mechanical signals, nor does it control the switches or link up to the PA. Instead, each train running on the lettered lines was equipped with a Bluetooth beacon (yes, the same technology that powers your wireless mouse) that trips a receiver as the subway nears a station, which then triggers the LCD screen over the platform to update. That seems like a prudent approach, not half baked. Keep the ancillary system air-gapped from the life critical parts.