47742 23/8/00 Tamworth High Level
Mounted on the nearside drivers window pillar on 47742 is the Propelling Advisory Control System (PACS) display unit. This was fitted to all Res 47s that had cab front mounted RCH cables, such as all the later series 47/7s and a few 47/4 machines.
When the locomotive was on the rear of a postal service and it was being controlled from a former Class 307 driving trailer (known as a PCV) the driver would power the train from the 47 following whatever segment of lights were lit at the bottom of the display, which corresponded with the power handle in the PCV. The braking of the train was controlled by the driver in the PCV. This mode of operation was only authorised to a maximum of 40mph on approach to certain locations where mail trains would terminate.
47742 23/8/00 Tamworth High Level
Mounted on the nearside drivers window pillar on 47742 is the Propelling Advisory Control System (PACS) display unit. This was fitted to all Res 47s that had cab front mounted RCH cables, such as all the later series 47/7s and a few 47/4 machines.
When the locomotive was on the rear of a postal service and it was being controlled from a former Class 307 driving trailer (known as a PCV) the driver would power the train from the 47 following whatever segment of lights were lit at the bottom of the display, which corresponded with the power handle in the PCV. The braking of the train was controlled by the driver in the PCV. This mode of operation was only authorised to a maximum of 40mph on approach to certain locations where mail trains would terminate.