The CLR looked to economise through the use of technological developments. The introduction in 1909 of dead-man's handles to the driver controls and "trip cocks" devices on signals and trains meant that the assistant driver was no longer required as a safety measure. Signalling automation allowed the closure of many of the line's 16 signal boxes and a reduction in signalling staff. From 1911, the CLR operated a parcel service, making modifications to the driving cars of four trains to provide a compartment in which parcels could be sorted. These were collected at each station and distributed to their destinations by a team of tricycle riding delivery boys. The service made a small profit, but ended in 1917 because of wartime labour shortages.