Question to the Department for Transport:
To ask Her Majesty's Government whether, for the bi-modal trains running under the Great Western franchise, the switch from diesel to electric and vice versa will occur whilst the train is on the move, and if so, whether at full speed, or slow speed, or whether the switch will be made whilst the train is in a station or otherwise not moving.
Intercity Express Trains running on the Great Western Main Line will be able to switch seamlessly between electric and diesel mode whilst on the move and whilst stationary. The speed of train during that power change will depend on the line speed at that location.