800020 Elizabeth Ralph & 800027 speed past Challow on 4 January 2019 with the 1B35 12:45 Paddington to Swansea GWR service. The massively delayed and hugely over budget electfrication scheme is complete here, and this train is clearly running off the 25Kv overhead. However, in an hour and a half at the lineside I saw several Class 800s pass by inexplicably still running on diesel.