Not directly related, but perhaps relevant in that it is CCTV on public transport.
In the seventies and eighties I worked for a city council's transport department and they started installing on board CCTV on their bus fleet in the mid eighties. There were (IIRC) a couple of quite large cameras in protective housings with glass fronts on each bus, one monitoring the door area and another upstairs. They recorded onto normal VHS video tapes and the recording equipment was in a housing under the stairs, I believe.
The cost of the kit was quite high and only a small proportion of the fleet were fitted with live cameras. The rest had dummy cameras with, of course, no recording equipment.
The ones with live kit were predominantly allocated to the more troublesome routes.