GWR Autocoach
The GWR Autocoach (or auto-trailer) is a type of coach that was used by the Great Western Railway for push-pull trains powered by a steam locomotive. The distinguishing design feature of an autocoach is the driving cab at one end, allowing the driver to control the train without needing to be located in the cab of the steam locomotive. This eliminates the need to run the engine round to the other end of the coach at the end of each journey. When one or more autocoaches are connected to a suitably equipped steam locomotive, the combination  is known as an auto-train, or, historically, a railmotor train. A steam locomotive provided with the equipment to be used as an autotrain is said to be auto-fitted. The autocoach is the forerunner of the driving trailer used with push–pull trains. Design features. A locomotive fitted with additional control equipment is used to power the autotrain. When running 'autocoach first', the regulator is operated by a linkage to a rotating shaft running the length of the locomotive, passing below the cab floor. This engages (via a telescopic coupling) with another shaft running the full length below the  floor of the autocoach. This shaft is turned by a second regulator lever in the cab of the autocoach. "(See photograph sequence below.)" The driver can operate the regulator, brakes and whistle from the far (cab) end of the autocoach; the fireman remains on the locomotive and (in addition to firing) also controls the valve gear settings. The driver can also warn of the train's approach using a large mechanical gong, prominently mounted high on the cab end of the autocoach, which is operated by stamping on a pedal on the floor of the cab. The driver, guard and  fireman communicate with each other by an electric bell system. Internally, the passenger section of the coach is divided into two open saloons – originally for smoking and non-smoking – with a lobby in the middle separating the two. There is usually a small guard's and luggage compartment at the 'loco' (non-driving) end of the coach. The seating layout is similar to the lower deck of a modern-day bus, with a mixture of normal seating and inwards-facing bench seats. Passengers access the coach via the lobby. The coach is equipped with retractable steps, which are extended if  the train stops at rural halts with either low or non-existent platforms, and which fold-in tight against the coach underframe to keep them clear of line-side obstructions when the train is moving. These steps are controlled by the guard using levers in the lobby. Some earlier autocoaches were converted from steam rail motors, by the removal of the integral steam engine. The most familiar type of autocoach was introduced in 1928. The design proved very long-lived, with 163 examples being built to a similar design. The last coaches were built some years after nationalisation by British  Railways in 1954. In operation. If more than one autocoach was used, the locomotive would usually be marshalled between the coaches, as 'play' in the control linkages could otherwise make operation difficult. This arrangement was not always possible where turntables were not convenient for turning coaches and hence up to two autocoaches could follow or lead a locomotive with cab ends away from the locomotive. Many GWR suburban services around Plymouth were formed of fixed autotrain formations of four autocoaches, two each side of the locomotive with cabs leading in each direction. When these were introduced in 1906, experiments were  made to harmonise the appearance of the locomotive in the middle of the train by cutting down the sidetanks and encasing the entire locomotive in a square bodyshell of the same basic design, height and width as the coaches, complete with 'windows' and the same chocolate/cream paint livery, thus giving the complete formation the appearance of a later multiple unit. Two 2021 Class and two 517 Class engines were modified in this way during 1906. The coachwork greatly restricted visibility, made coaling, watering and servicing the locomotives awkward and initial concerns that passengers would be deterred by the unusual  sight of a locomotive running in the middle of a train proved unfounded. The dummy coachwork was removed from all four locomotives during 1911. Fleet list. 233 finished its passenger service with British Rail in 1964 and was subsequently used by BR for a variety of non-passenger purposes as Test Car 1 at Derby D of D, (the old CM&EE.) where it was used for ride testing all types of new and old freight rolling stock. It was part of a catenary test train hired by Balfour Beatty for the then new Channel Tunnel and where it achieved 104  M.P.H. in test runs. When purchased by 5542 Ltd in July 2013, it had no seats, a large diesel generator, a kitchen sink unit, remnants of computer equipment, BR Mk 1 toilet, dual Air/Vacuum brakes, B4 bogies, Oleo pneumatic buffers and all of its auto-train control gear removed but has now been refurbished although retaining many of its test car features. Auto-fitted locomotives. Several locomotive classes included examples equipped to work in autotrains at different times. These included: