British Rail Mark 3

British Rail's third fundamental design of carriage was designated Mark 3, and was introduced in 1976 primarily for use on the High Speed Train (HST). The coaches were also used as conventional loco-hauled stock as part of the West Coast Main Line (WCML) northern electrification scheme in the mid 1970s, designated Mark 3A and 3B. The final batch was built in 1988, but Mark 3-based multiple units continued to be built until the early 1990s.

British Rail Mark 3
Chiltern Railways Mark 3 with retrofitted plug doors at London Marylebone in August 2012
In service	1975- present
Manufacturer	BREL
Number built	848 vehicles
Operator(s)	CrossCountry East Midlands Trains First Great Western First ScotRail Grand Central Railway National Express East Anglia Virgin Trains East Coast Network Rail Wrexham & Shropshire
Specifications
Maximum speed	125mph 200km/h

Mark 3 at Leicester.

A Mark 3 TS coach pictured at London Paddington, in old First Great Western colours

A Mark 3 TS coach pictured at Aberdeen, in GNER colours

The original BREL-designed interior - this photo is of a First Great Western standard class Mark 3 coach

Interior of a new First Great Western high Density HST Carriage

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