LNER Gresley K4 61994 The Great Marquess

LNER 3442 The Great Marquess

The Great Marquess on a railtour at Stirling

Type and origin Power type Steam Designer Nigel Gresley Builder Darlington Works Build date 1937

Specifications Configuration 2-6-0 Gauge 4 ft 8 ^1⁄2 in (1,435 mm) Driver dia. 5 ft 2 in (1.575 m) Loco weight 68.4 long tons (69.5 t) Tender weight 44.2 long tons (44.9 t) Fuel type Coal Water cap 3,700 Gallons (extended water capacity - originally 3,500 Gallons) Firebox:  • Firegrate area 28 ^1⁄2 sq ft (2.65 m^2) Boiler pressure 200 psi (1.38 MPa) Cylinders Three Cylinder size 24 in × 1.244 in (609.6 mm × 31.6 mm) Valve gear Walschaerts Valve type Piston valves

Performance figures Tractive effort 36,600 lbf (162.80 kN)

Career Operators London and North Eastern Railway → British Railways Power class 6MT Axle load class BR: Route Availability 6 Withdrawn December 1961 Current owner John Cameron Disposition Operational, Mainline Certified

LNER 3442 The Great Marquess is a member of the London and North Eastern Railway (LNER) Class K4 designed by Nigel Gresley for the steep grades of the West Highland Line. She was re-numbered 61994 by British railways after the 1948 nationalisation of Britain's railways.

Overview

The North British Railway (NBR) West Highland line to Mallaig via Fort William presented many operating problems due to its steep gradients and severe curves, combined with very restrictive axle loading limits. At Grouping in 1923, passenger services were being hauled by D34 'Glen' 4-4-0s due to the axle loading restrictions. Heavier stock had already entered service, and was already resulting in some double-heading of the D34s. An early proposal was to use the new K3s to provide extra power, but they would have been restricted from the Mallaig section of the line, and was vetoed completely by the Civil Engineer after K3 bridge tests were made.

The K4's began construction in 1937 but just 6 members of the class were built, 3442 was the 2nd member of the class to be built. Named "The Great Marquess" in August 1938 3442 was mainly used on the Glasgow to Fort William stretch of the West Highland line. The K4's handled the gradients and continuous curves with ease, but they were not designed for the 20 miles of level track near Glasgow, and the 8.5 miles stretch alongside Loch Eil. Vibration at speed was a problem on these stretches, and the middle big-end would require regular nut tightening. After Nationalisation more powerful engines found their way to Fort William and 61994 was moved down to Eastfield where she was to spend most of her BR Career.

In 1959, 61994 and the other four members of the K4 class were transferred to Thornton Shed for use on goods trains until October 1961 when withdrawal's began. 61994 Was the last member of her class to be withdrawn in December 1961.

Preservation

61994 was bought from British Railways by Viscount Garnock and so began her long career in preservation. 61994 has had many mainline careers in preservation and has also been allocated to a number of heritage railways including the Severn Valley Railway, East Lancashire Railway, North Yorkshire Moors Railway & even at one point the Keighley & Worth Valley Railway, but she has also even travelled on routes she would never have gone in steam days including "The Settle and Carlisle line", Conwy Valley Line, North Wales Coast Line & even the West Coast & East Coast Main Lines. During her many mainline careers as well as returning to her old haunts in Scotland on the West Highland Line she has also visited a number of places in preservation that her class would never have visited in steam days including Carlisle, Worcester, Barrow Hill, Blaenau Ffestiniog & many others.

Currently owned by John Cameron who also owns LNER A4 Pacific no 60009 Union of South Africa both engines are usually based at Thornton but recently both have seen major action around the North West of England allocated to Crewe hauling charter trains.

61994 is currently located at the North Yorkshire Moors Railway.