The bringer of doom (if you're a railway photographer), or the bringer of progress (if you're a passenger). Brand new Windhoff electrification units 99 70 9131 001-8 & 99 70 9131 005-9 pass Bourton on 16 February 2014 with the 6Z09 11:30 Swindon Transfer to Swindon Transfer (via Didcot) crew training run. This was the first of five round trips run during the day. These units (or factory trains, as Network Rail optimistically call them) were to be used for the Great Western Mainline electrification programme.