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British Railway Steam Locomotive

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Note: To Obtain Consistency in the Steam System, Shed Codes used are those Registered at Nationalisation on 1st January 1948
2nd Grouping Number
1st Grouping Numbersr 495
2nd Pre Grouping Number
1st Pre Grouping Numberlsw 495
Works/Lot Number
Class CodeG16
DesignerUrie R W
BuilderEastleigh Works (LSWR/SR/British Railways)
1948 Shed70B Feltham
Last Shed70B Feltham
Disposal detailsEastleigh Works (B.R.)
DisposalCut Up
Disposal Date31/01/1963
NotesMaunsell Superheater fitted Mar 1930

Class Information

The LSWR G16 class is a steam tank locomotive class of 4-8-0T wheel arrangement. It was designed by Robert Urie and introduced in 1921 specifically for heavy shunting over humps at Feltham marshalling yard, on the London and South Western Railway (LSWR). They were based upon Urie's previous S15 class freight design, and apart from several periods of operating eleswhere on the LSWR and Southern railway network, they remained at Feltham for most of their operational careers.

With the fast growth of the LSWR's London area goods traffic in the early years of the twentieth century, the company decided to construct a modern gravitational marshalling yard at Feltham. This location gave excellent access to the company main lines as well as direct links to the Great Western Railway and London and North Western Railway, and to the Midland Railway, Great Northern Railway and Great Eastern Railway via the North London line. Although completion of Feltham yard was delayed by the First World War, it was completed soon after. A new design of locomotive was required to haul heavy freight trains over the various flyovers that large marshalling yards such as Feltham had.

Urie had designed four very large shunting tanks based on his S15 goods 4-6-0s, except for utilising a somewhat smaller boiler, and eight-coupled wheels of 5 feet 1 inch (1.549 m) diameter for extra traction, they were clearly intended mainly for hump shunting duties. Urie's design resulted in massive locomotives that weighed in at 95 tons, and were the most massive and powerful locomotives on the LSWR system. When passed over to Southern Railway ownership, the new Chief Mechanical Engineer Richard Maunsell gave consideration to constructing more G16 locomotives, but instead decided to develop his SR Z Class 0-8-0T, so the G16 class remained numerically small at only four. Originally it had been intended to use them for transfer and trip workings so superheating was provided. Originally these were the Eastleigh design of superheater, but in later years these were replaced by the Maunsell pattern. This turned out to be a hindrance to the shunting activities and most of the transfer and trip workings were assigned to the similar H16 class of 4-6-2 tanks. The G16 and H16 classes shared many components of the same design, such as boilers and fireboxes. The G16s, along with the T14s and H16s, were the widest standard gauge steam locomotives ever to run in Britain.

Although they were tried out on other duties around the system, most of their life was spent allocated to the new shed at Feltham. The lack of maintenance for most locomotives during World War II meant that such massive and reliable machines as the G16s continued their hard work even in very run-down condition. Inevitably, the introduction of the ubiquitous 0-6-0 diesel electric shunters at Feltham in the 1950s made the G16s redundant. They were used occasionally on empty stock and van trains, from various depots such as Guildford, but these duties were limited in numbers and further electrification in the Southern Region meant that there was a surplus of locomotives in the late 1950s. One G16 was withdrawn in 1959, another in 1960 and the final two in December 1962.

The first two locos withdrawn were 30492 and 30493 in January 1959 and January 1960 respectively from Feltham shed.
The last two locos 30494 and 30495 were withdrawn in December1962 from Feltham shed.
All were cut up at Eastleigh Works.
None are preserved.

Technical Details

Designer : Robert Wallace Urie
Builder : LSWR Eastleigh Works
Build date : 1921
Total produced : 4 - Total to BR 4
Configuration : 4-8-0T
UIC classification : 2'Dht
Gauge : 4 ft 8 in (1,435 mm)
Leading wheel diameter : 3 ft 7 in (1.092 m)
Driver wheel diameter : 5 ft 1 in (1.549 m)
Length : 42 ft 10 in (13.06 m)
Width : 9 ft 2 in (2.79 m)
Height : 13 ft 1 3/8 in (4.00 m)
Axle load : 18.50 long tons (18.8 t)
Weight on drivers : 72.90 long tons (74.1 t)
Locomotive weight : 95 tons 2 cwt (96.6 t)
Fuel capacity : 3.50 long tons (3.6 t)
Water capacity 2,000 imp gal (9,100 l; 2,400 US gal)
Boiler pressure : 180 lb sq in Su(1.24 MPa)
Firegrate area : 27 sq ft (2.5 m2)
Heating surface tubes and flues : 1,267 sq ft (117.7 m2)
Heating surface firebox : 139 sq ft (12.9 m2)
Superheater type : Eastleigh (later Maunsell)
Superheater area : 231 sq ft (21.5 m2)
Cylinders : Two (outside)
Cylinder size 22 in 28 in (559 mm 711 mm)
Valve Gear: Walschaerts (piston valves)
Tractive effort : 33,990 lbf (151.20 kN)
Factor of adhesion : 4.4 (with tanks and bunkers half full)
Career : LSWR, SR, BR
Class : LSWR / SR: G16
Power class : SR: A; BR; 7F, later 8F
Nicknames : Black Tanks
Common Name : Hump Engines
Number Series : 30492-30495.
Retired : 19591961
Disposition : All scrapped

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