"In the UK, such crossings are categorised as 'Manually Controlled Barriers' (MCB) because they are always manually controlled, usually from a signal box. Some are known as MCB-CCTV level crossings, because they are supervised by video link to the signal box from which they are remotely controlled." (Wikipedia )
Some modern MCB crossings are of type MCB-OD, which uses obstacle detectors to determine the crossing is clear rather than a visual check by the Signaller.
Last edited by GeoffM on 15/09/2016 at 03:00