Question to the Department for Transport:

To ask the Secretary of State for Transport, whether her Department has made an assessment of the potential impact of introducing additional diesel multiple units to the Great Western Railway fleet on the environment; and whether she plans to take steps to help mitigate the environmental impact of diesel trains on Great Western Railway services.

Great Western Railway (GWR) is introducing additional diesel units from the end of this year. This will enable older diesel units to be retired and provide more resilience across the network. The Department continues to work with the industry to develop plans to move towards decarbonisation in the longer term.