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2800 class introduction

Running numbers: 2800 - 2899, 3800 - 3866.

Built:    1903            (2800) to lot number 139,
           1905            (2801 - 2810) to lot number 153,
           1905            (2811 - 2820) to lot number 155,
           1907            (2821 - 2830) to lot number 160,
           1911            (2831 - 2835) to lot number 181,
           1912            (2836 - 2845) to lot number 186,
           1912-13       (2846 - 2855) to lot number 190,
           1918-19       (2856 - 2883) to lot number 210,
           1938-39       (2884 - 2899, 3800 - 3803) to lot number 321.
           1939-40       (3804 - 3823) to lot number 328,
           1940-41       (3824 - 3833) to lot number 334,
           1941-42       (3834 - 3843) to lot number 341,
           1942            (3844 - 3866) to lot number 346,

    The prototype of the '2800' class, number 97, was the first locomotive to operate in Britain with this wheel arrangement. It was fitted with the Standard number 1 boiler working at 200 p.s.i. and cylinders of 18 inches diameter. In order'2800' class, number 2857 at the Severn Valley Railway to allow some flexibility over the 16 feet 10 inch wheelbase, the tyres on the second and third pair of driving wheels used thinner flanges and the front pair of coupling rods were fitted with spherical joints in order to permit a small amount of side play. It was renumbered 2800 in 1906.

      The first production batch of 20 engines had the smokebox saddle raised more than the prototype so that the boiler pitch was raised by 8½ inches (as shown by the amount of daylight visible under the boiler). '2884' class, number 2857This batch also introduced 225 p.s.i. boiler pressure to the class.

      The second batch of 10 engines were identical except that the cylinders were bored out to 18.375 inches, which was altered again when superheating was introduced to 18½ inches.

      The designed load for the class was 60 wagons. A test train comprising of engine no. 2806, a dynamometer car and 54 wagons began trials with the load progressively increased until 100 wagons were hauled. This then became the standard loading for the class.

      With additions of windowed cabs, a casing for the fire irons and outside steam pipes fitted as standard, the last batch  ( 2884 - 2899 & 3800 - 3866 ) brought the total number of the class to 167. This later batches were known as the '2884' class to highlight the differences from the earlier locomotives.

Modifications.
    To strengthen the front frame overhang,'2884' class, number 2872 pictured when fitted with oil burning equipment in 1946 support struts were fitted between the smokebox saddle and the front end of theframe to all members of the class from 1908. As with most GWR locomotives, superheating was added in 1909, firstly to number 2808 whilst top feed was fitted as standard from number 2836 in 1912 with previous engines being so modified. Meanwhile the front frame was altered to the familiar curved shape in 1911 from number 2831 and again previous members were modified later. The shape of the curved frame was not as great as the type fitted to the 'Saint' class for example, since the size of the driving wheels gave a low height running plate. The last modification to the class was the use of outside steam pipes together with a new pattern of cylinder block introduced in 1934.

Withdrawal.
    The first of the 2800 class to be withdrawn was the prototype, number 2800 in April 1958 after travelling 1,319,831 miles, whereas the last engine in service until November 1965 was number 3836.

Preservation.
    16 engines of the class have been preserved and they are numbers 2807, 2818, 2857, 2859, 2861, 2873, 2874, 2885, 3802, 3803, 3814, 3822, 3845, 3850, 3855 and 3862.


Specifications (long cone boiler with superheater).

Cylinders (2) 18 x 30 inches Driving wheel diameter 4 feet 7 inches
Bogie wheel diameter 3 feet 2 inches Tractive Effort 35,380 pounds
Boiler type Number 1 Boiler maximum dia. 5 feet 6 inches
Boiler minimum dia. 4 feet 10 13/16 inches Fire tubes, no. and dia. 176 x 2 inches
Flue tubes, no. and dia. 14 x 5 1/8 inches Superheater tubes, no. and dia. 84 x 1 inch
Boiler pressure 225 lbs/square inch. Boiler length 14 feet 10 inches
Area of firegrate 27.07 square feet Heating surfaces, tubes 1,686.6 square feet
Heating surfaces, firebox 154.78 square feet Heating surfaces, superheater 262.62 square feet

    

Details: 2800 class, 2800 to 2883    Details: 2884 class, 2884 to 3866

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