Train reporting numbers were used to identify trains in the internal working timetable. These contained one or more letters or numbers either to uniquely identify a particular train, or to denote its route (particularly on busier lines). The reporting number was displayed on the front of the loco along with the lamp headcode. This happened usually with special trains or other unusual trains (e.g. summer Saturday excursions), to allow signallers to identify unfamiliar trains and route them correctly.