R40568 RailRoad Royal Mail TPO Coach 80331 - with working TPO catcherExpected Delivery Q2 2026 (Subject to Change at Manufacturer's Discretion). The Traveling Post Office (TPO) has been a fixture on Britains railways since mail was first carried on trains in the 1830s. The sorting of mail in transit gradually reduced in the 21st century as mechanised sorting at depots became commonplace and concerns about the safety of workers carrying out letter sorting at increased main line speeds. The last TPO using carriages in