Over the years, the need for shunting locomotives declined dramatically.
As late as 1980, BR still had nearly 1,000 of the small, reliable, but woefully underused diesel locomotives.
Even small stations such as Boston, Ely, St Austell and Berwick had a little diesel shunter stabled on standby. They were also used in yards, exchange sidings and carriage sidings.
But even the booked station work was limited to a couple of hours a day. And while they were all bought and paid for, they still needed maintenance, fuel, and occasional overhauls.
As the railway moved away from wagonload freight and pick-up goods, the role for the shunter - typically two types, the Standard Small shunter (Class 03) and the Standard Large shunter (Class 08/09) - diminished.
At privatisation, the remaining Class…