This video from oorail.com walks you through taking the Hornby Mark 4 DVT apart. The DVT in this video is R.268 from Hornby in InterCity Swallow Livery. This DVT was part of the InterCity 225 set but the chassis frame - not the body shell - had warped in storage resulting in the rear bogey touching the frame. The DVT would work fine when it was the trailing car, but when it was the driving car (motorized Class 91 running in reverse), the DVT would cause the train to derail around curves. The…