Track Maintenance Machines must Travel only on the Authority of Fixed Signals.
Fixed Signals displayed to the first Vehicle apply to all Track Maintenance Machines in
the Convoy.
A Track Maintenance Machine must not Set Back without the Authority of the Train
Controller.
After the Track Maintenance Machines have passed the Protecting Signal, the Train
Controller must ensure the Protecting Signal is at Stop and Blocking Facilities applied,
in accordance with Rule 5023 Manual Block Working.