LNWR Teutonic Class explained

LNWR Teutonic class
Powertype:Steam
Designer:F. W. Webb
Builder:Crewe Works
Serialnumber:3102–3111
Builddate:March 1889 – June 1890
Totalproduction:10
Whytetype:2-2-2-0
Uicclass:1AA n3v
Leadingdiameter:3feet + tyres
Driverdiameter:6feet + tyres
Engine Total:18feet
Leading:8feet
Drivers:9feet
Diameterinside:4feet
Lengthinside:11feet
Boilerpressure:1752NaN2
Totalsurface:1401.5square feet
Cylindercount:Three: two HP (outside), one LP (inside)
Hpcylindersize:14x
Lpcylindersize:30x
Operator:London and North Western Railway
Scrapdate:October 1905 – July 1907
Disposition:All scrapped

The LNWR Teutonic class was a class of 10 passenger three-cylinder compound 2-2-2-0 locomotives designed by F. W. Webb for the London and North Western Railway, and manufactured by them in their Crewe Works between 1889 and 1890.

Design

The design featured a boiler pressed to 1752NaN2 delivering saturated steam to two outside 140NaN0 high-pressure cylinders, which exhausted to one 300NaN0 low-pressure cylinder inside the frames. All three cylinders had a stroke of 24inches; the high-pressure cylinders drove the rear wheels, while the low-pressure drove the leading driving wheels. As the two pairs of driving wheels were not connected, the locomotives were "duplex drive" or "double-singles".

They were a development of Webb's Dreadnought class; they had larger driving and leading wheels, and the additions of cylinder tail rods (which were later removed). There were also further modifications to the Joy valve gear, but the seven locomotives built in 1890 had the inside cylinder worked by slip-eccentric valve gear instead from new.

Of the ten locomotives, nine were named after ships of the White Star Line, the exception was named after a character in a Walter Scott novel, as it was exhibited at the Edinburgh International Exhibition of 1890.

Decline

When George Whale become chief mechanical engineer of the LNWR in 1903, he started a programme of eliminating Webb's over-complicated duplex compound locomotives. Consequently, the class was scrapped between October 1905, and July 1907, having been replaced by Whale's Experiment class.

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