bramling
Veteran Member
Do you mean MCB - manually controlled barriers? AHBs are, as the name suggests, automatic and not directly controlled from the box.
(edit: a quick look suggests that it’s actually barriers monitored by CCTV, but that the list is actually a list of gate boxes with the disclaimer that some might not control manually-worked gates, and there’ll of course be signal boxes not listed there that *do* control such crossings!)
Whyteleafe South is an odd one in that it’s a CCTV crossing but controlled from an office inside the station building. Unless that arrangement has changed in the last few years.