LNER Class W1 No. 10000

The LNER W1 No. 10000 (also known as the Hush-Hush due to its secrecy) was an experimental steam locomotive fitted with a high pressure water-tube boiler. Nigel Gresley was impressed by the results of using high-pressure steam in marine applications and so in 1924 he approached Harold Yarrow of shipyard & boilermakers Yarrow & Company of Glasgow to design a suitable boiler for a railway locomotive, based on Yarrow's design.
== Boiler==
The boiler was not the usual Yarrow design. In operation, particularly its circulation paths, the boiler had more in common with other three-drum designs such as the Woolnough. It has also been described as an evolution of the Brotan-Deffner water-tube firebox, with the firebox extended to become the entire boiler.
The boiler resembled two elongated marine Yarrow boilers, joined end to end. Both had the usual Yarrow triangular arrangement of a central large steam drum above two separated water drums, linked by multiple rows of slightly curved tubes. The rearward "firebox" area was wide and spanned the frames, placing the water drums at the limits of the loading gauge. The forward "boiler" region was narrow-set, with its water drums placed between the frames. The space outboard of the tubes formed a pair of exhaust flues leading forwards. A large space outside these flue walls but inside the boiler casing was used as an air duct from the air inlet, a crude rectangular slot beneath the smokebox door, which had the effect of both pre-heating the combustion air and also cooling the outer casing to prevent overheating. Longitudinal superheater tubes were placed between the steam generating tubes. The third area forwards contained superheater headers, the regulators and the smokebox. The external boiler casing remained at much the same width throughout, giving an overall triangular, but curved, appearance. The lower edge of each section stepped upwards, and was obvious externally.
Working pressure was of 450 pounds per square inch (31.0 bar; 3,100 kPa) as opposed to the 180 pounds per square inch (12.4 bar; 1,240 kPa) of the contemporary Gresley A1 locomotives.
== Motion ==
This apparatus was based on a Gresley Pacific 4-6-2 chassis, although with an additional axle to accommodate the extra length. This resulted in a 4-6-4 wheel arrangement, making No. 10000 the only standard gauge 4-6-4 tender engine to run on a British railway.
In UIC notation this wheel arrangement could be described as a 2′C1′1′ (or more fully, 2′C1′1′h4vS) as the two trailing axles were independent, rather than a four-wheeled bogie as for those leading. The forward axle was similar to that of the Pacifics, having outside frames and Cartazzi axleboxes. The rear axle was an inside-framed Bissel truck, pivoted ahead of the leading axle.
The high pressure necessitated compound expansion; steam being supplied to the two 12-by-26-inch (305 mm × 660 mm) high-pressure inside cylinders and then fed into two larger 20-by-26-inch (508 mm × 660 mm) low-pressure outside cylinders before going to exhaust. High-pressure cylinder diameter was subsequently reduced to 10 in (254 mm). Gresley incorporated an ingenious unique system for giving independent cutoff to the high-pressure cylinders using only two sets of Walschaerts valve gear derived from the outside cranks on the Von Borries principle and using an inside half-length expansion link.
==Rebuild ==
When it was deemed that no further progress could be made, the locomotive was taken to Doncaster Works in 1936 and rebuilt with a conventional boiler and three simple expansion cylinders on the normal Gresley layout. A modified A4 boiler was fitted which had 50 sq ft (4.6 m2) of grate area and 20 in (508 mm) diameter cylinders. The valves were considered undersized for the large cylinder diameter and this somewhat limited the speed capabilities of the engine. Its haulage capacity was nonetheless appreciated. The rebuilt engine still retained its additional axle, resulting in a more spacious cab for the driver and fireman. The tender was not rebuilt, but was modified slightly at the front so that the ends of the curved side sheets now finished 8 feet 2+3⁄8 inches (2.499 m) apart; it was also given streamlined plating at the top (which was removed again in January 1938) and a longer coal chute.
No. 10000 never carried a name, although it did carry small works plates on the smoke deflectors bearing the number 10000. In its early form, it was known unofficially as the Hush-Hush as a result of the initial secrecy surrounding the project, and also the Galloping Sausage as a result of its bulging boiler shape. Plans in 1929 to name the original engine British Enterprise were dropped, although nameplates had already been cast; a 1951 plan to name the rebuilt engine Pegasus did not come to fruition either. During a works visit in May/June 1948, the corridor tender was exchanged for one of the non-corridor type, and it was given British Railways livery and renumbered 60700.
On September 1, 1955, 60700 had just departed from Peterborough when the front bogie frame broke. The locomotive derailed at a speed of 20 miles per hour (32 km/h) at Westwood Junction. It was recovered and repaired.
No. 60700 was withdrawn on June 1, 1959 and was broken up for scrap at the Doncaster Works later that year. The first of its two tenders did survive into preservation. Corridor tender No. 5484 is now attached to No. 4488 Union of South Africa.
==Trivia==
*The W1 was known to be a 4-6-4 Hudson/Baltic type, but a little number of people claim it to be a 4-6-2-2 steam locomotive because those people claim that it's trailing bogie has an articulation, but there's no direct evidence on that being true.
==Gallery==
File:The Hush-Hush.jpg|The W1 getting Ready to steam
File:Engine 10000 (Wonder Book of Engineering Wonders, 1931).jpg
File:LNER A4 Pacifics, 1937 (Our Generation, 1938).jpg
File:Engine 10000 on turntable (Wonder Book of Engineering Wonders, 1931).jpg
Category:High Pressure Steam Locomotives
Category:Steam locomotives
Category:Experimental locomotives
Category:Built in 1929
Category:Locomotives
Category:Scrapped locomotives
Category:4-6-4 steam locomotives
Category:4-6-4 locomotives
Category:Tender locomotives
Category:British Rail locomotives
Category:British locomotives
Category:British steam locomotives
Category:United Kingdom
Category:Rebuilds
Category:Doncaster Works locomotives
Category:Darlington Works locomotives
Category:4 foot 8 1⁄2 inch gauge
Category:Standard gauge locomotives
Category:LNER locomotives
Category:Scrapped steam locomotives
Category:Standard gauge steam locomotives of Great Britain