 | This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. (June 2016) |
| British Rail First Open | |
|---|---|
 Mark 3 First Open coach at Marylebone in September 2008 | |
| In service | 1951– |
| Manufacturer | Derby Litchurch Lane Works Doncaster Works Swindon Works Wolverton Works York Carriage Works Birmingham Railway Carriage & Wagon Company Metro-Cammell |
| Family name | British Railways Mark 1, Mark 2, Mark 3 and Mark 4 |
| Constructed | Mk1 1951–1963 Mk2 1970-74 Mk3 1976-85 Mk4 1989-92 |
| Fleet numbers | Mk1: 3000-3151 Mk2c: 3152-3169 Mk2d: 3170-3216 Mk2e: 3221-3275 Mk2f: 3276-3439 Mk3: 11000-11003/41003-41169 Mk3a: 11004-11063 Mk3b: 11064-11101 Mk4: 11200-11263 |
| Capacity | Mk1: 42 Mk2c/d/e/f: Mk3/a/b: 48 Mk4: 46 |
| Operators | British Rail InterCity ScotRail Abellio Greater Anglia Anglia Railways Arriva CrossCountry Cargo-D Chiltern Railways Direct Rail Services East Coast East Midlands Railway East Midlands Trains East Midlands Railway First Great Western FM Rail GNER Midland Mainline National Express East Anglia National Express East Coast London North Eastern Railway Riviera Trains Virgin CrossCountry Virgin Trains East Coast Virgin Trains West Coast West Coast Railways |
| Specifications | |
| Car length | Mk1: 64 ft 6 in (19.66 m) Mk2/a: 65 ft 4 in (19.91 m) Mk2b/c/d/e/f: 66 ft 0 in (20.12 m) Mk3/a/b: 75 ft 0 in (22.86 m) Mk4: 23.4 m (76 ft 9+1⁄4 in) |
| Width | Mk1: 9 ft 3 in (2.82 m) Mk2/a:9 ft 3 in (2.82 m) Mk2bb/c/d/e/f: 66 ft 0 in (20.12 m) Mk3/a/b:75 ft 0 in (22.86 m) Mk4: 2.74 m (8 ft 11+7⁄8 in) |
| Height | Mk1 & Mk2: 12 ft 9+1⁄2 in (3.90 m) |
| Doors | Mk1 Manual slam doors, two on each side Mk2c/d/e/f Manual slam doors, two on each side Mk3/a/b Manual slam doors, two on each side (some modified to automatic plug doors) Mk4 Automatic plug doors, two on each side |
| Maximum speed | BR1/Cw: 90 mph (145 km/h) B4: 100 mph (161 km/h) BT10: 125 mph (201 km/h) SIG/BT41: 140 mph (225 km/h) |
| Weight | 32.5 to 36.5 long tons (33.0 to 37.1 t; 36.4 to 40.9 short tons) |
| HVAC | Steam or electric heat, or both |
| Bogies | BR1, Commonwealth, B4, BT10 or SIG/BT41 |
| Braking system(s) | Vacuum, air, or both |
| Coupling system | Drop-head knuckle coupler on draw-hook (dual) |
| Track gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge |
A First Open or FO, is a type of railway carriage used by British Rail and subsequent operators since privatisation. They were first produced as British Railways Mark 1, and subsequently Mark 2, Mark 3, and Mark 4 variants were produced. This type of carriage is an "open coach" because of the arrangement of the seats inside – other types of carriage may be corridor based variants (FK) or have a brake compartment (BFO or BFK).