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Prototype Era
Era 3 (1923 to 1947) The Big Four (LNER, LMS, GWR and SR)
The prototype coaches were constructed between 1914 and 1920 made of steel body sides with an absence of panelling but with bolection mouldings around the windows and frosted glass top light windows, sitting on Churchward 9’-0” bogies. They were designed to operate as a set comprising Left hand and right-hand Brake Thirds, 1 or 2-Thirds and left hand and right-hand Composites enabling all corridor windows to be displayed on the same side, commonly used for cross country and main line working between cities.
Chassis
Body
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Dapol GWR Corridor Toplight 1935 Chocolate & Cream Roundel All‑Third coach, model number 4P‑021‑301, is a 00‑gauge (16.5 mm) kit representing the Big Four era of British railways.
The prototype coaches were built between 1914 and 1920 with steel body sides, bolection mouldings around the windows and frosted‑glass top‑light windows, and were mounted on Churchward 9‑ft (2.74 m) bogies. They were intended for use as a mixed set of left‑hand and right‑hand brake thirds, 1‑ or 2‑thirds and composites, allowing all corridor windows to face the same side for cross‑country and main‑line services.
Key chassis features include die‑cast bogie frames with stamped metal compensation beams for wheel‑bearing electrical pick‑up, two styles of underframe truss rods, and die‑cast chassis framing. Couplings are close‑coupled on a cam for negotiating R2 (438 mm) curves and are fitted with NEM pockets for magnetic couplings, although NEM‑compatible traditional couplings may be supplied by the modeller. Wheels are sized for 00 gauge but provide clearance for 18.2 mm gauge wheels; axles are 26 mm over the end points and sprung metal buffers are included.
The coach body is supplied in separate ABS‑plastic side panels, with gap‑free corridor connections suitable for R2 curves, and a fitted interior luggage rack in each passenger compartment. Depending on the period chosen, separate shell ventilators are mounted on the roof. Metal door and commode handles are provided, and destination boards are supplied separately for fitting. All coaches come with interior lighting and a DCC decoder plug together with a blanking plug.