43158 & 166202 Sonning 16 August 2016

An unequal race! 43158 rapidly overtakes 166202 in Sonning cutting on 16 August 2016, as it works the 1B51 15:45 Paddington to Swansea GWR service. 166202 is working the 2R47 15:12 Paddington to Reading stopping service.