The multi object bay (commonly referred to as a peripheral post) consists of an open frame arrangement containing object controllers and conditioning modules.
The innovative approach of the HMR CBI means that the control equipment can be installed either inside a peripheral location (containing one or more multi-object bays), inside a case at the side of the track, or in a trackside functional module in the immediate area around the signalling equipment (on a signal mast or gantry). It is also possible to have a wireless connection to equipment at the side of the track.