Clerestory stock (GWR)
The first clerestoried arrangements on British railway carriages were modifications of older arc roofed stock. Elevated and centred raised roof sections were added above the original profile, often with ventilators and partial glazing along the sides. This took the architectural 'clear storey' name, and the principle was adopted very successfully into coach design to admit light, fresh air, or both. Although not a common arrangement on the GWR, some clerestories did curve downwards at the vehicle ends to match the original roof profile.
The illustration shows a CPL Diagram E 26 non corridor composite
C 18 Corridor 3rd - £38.50 4mm
D40 Corridor Brake 3rd - £38.50 4mm