The motor is usually controlled remotely by the dispatcher (signaller in the UK). Corporal MacDonald, acting as duty signaller that night, was asked by Sgt. These legacy gated crossings are locally operated by a signaller or other railway staff. This failure was likely due to work overload of the signaller. With ERTMS, the driver has to communicate with the signaller. She also served in the Territorial Army as a signaller. Signals thus evolve because they modify the behaviour of the receiver to benefit the signaller. This was misheard as "Felix" by the signaller and was never changed. New signallers to 301st Signal Squadron have to complete the Special Forces Signaller Course (SFSC). The signaller would then be required to initiate an alternative operating procedure. The signaller would adjust his line-side signals accordingly.