The High-Speed Post Train is a high-speed diesel locomotive belonging to the Other Railway. It delivers mail and parcels between Sodor and the Mainland. It only appeared in the annual story Toby and the Mail Train.
The High-Speed Post Train is a British Rail Class 43 HST. It bears the number "43047" which belongs to a real Class 43. Pip and Emma are other members of this class.
The High-Speed Post Train is painted blue and purple with red and yellow stripes. In real life it is currently painted in a similar livery, but with East Midlands Trains branding and a yellow warning panel.