tri-composite en este sentido se refiere a trenes.


Tri-Composite
A carriage with seats for First, Second and Third Class ticket holders. This type of coach is represented in preservation by a LSWR Tri-composite Brake carriage in the National Railway Museum. Second class was abolished, with the exception of Boat trains, in the early years of the century. The Midland Railway started the trend by upgrading all their third-class seats to second-class standard. In 1956 Third Class was re-named "Second", and then again more recently as "Standard".