 As part of its franchise commitments First Great Western announced that it will refurbish the entire fleet and re-engine all power cars with the MTU engine 

In January 2006 the first batch of power cars were taken to Brush Traction to have MTU engines installed.This work has now been completed.Twenty-six of First Great Western's InterCity 125 fleet have been refurbished into a high-density layout of mostly airline seats for services in the M4 corridor to Bristol and Cardiff.