No. 1011 County of Chester was a Great Western Railway 1000 Class or County Class 4-6-0 steam locomotive built in 1946 at Swindon Works. It was one of thirty examples of this class built between 1945 and 1947.
After the nationalization of Britain's railways in 1948 all 30 Counties continued to do useful work throughout the Western Region of British Railways, working on expresses to and from Paddington as well as more menial freight and parcels tasks. BR gave the Counties the power classification 6MT. Speedometers were fitted to the class from 1950 and modified double chimneys from 1956.
Withdrawals of the class took place between September 1962 and November 1964. No. 1011 County of Chester was the last of the class withdrawn. It was placed in storage before being sold to Cashmore's Scrapyard in Newport where it was cut up in March 1965.
A replica of No. 1014 County of Glamorgan is currently under construction as a "new-build" project, based at Didcot Railway Centre in Didcot, Oxfordshire. It will incorporate salvaged parts from it's scrapped County Class siblings including No. 1011 County of Chester regulator in it's final design.