The reference for locomotives and railcars
London, Brighton & South Coast class I1
Great Britain | 1906 | 20 produced
collection Peter Boor

The I1 was built in two batches of ten locomotives each in 1906 and 1907 for the suburban lines in south London. They had a 4-4-2T wheel arrangement with a five foot six inch driving wheel diameter and a condensing apparatus for use in urban environments. In the second batch, the driving wheels and coupling rods of the class D1 were used, what shortened the wheelbase.

Occasionally they were also used as far as Brighton or hauled the royal train. However, they were bad steamers on suburban lines with short distances between stations. After being taken over by the Southern Railway, between 1925 and 1932 they received new superheated boilers left over from the rebuild of the classes I3 and B4. Now performing better only two were retired before 1948 and the the last ones of the remainder were used by British Railways until 1951.

Axle config4-4-2T (Atlantic) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Service weight152,992 lbs
Adhesive weight81,984 lbs
Axle load40,992 lbs
Water capacity2,381 us gal
Fuel capacity7,280 lbs (coal)
Power sourcesteam
Starting effort17,433 lbf
Power Plant
Driver diameter66 in
Boiler pressure170 psi
Expansion typesimple
Cylinderstwo, 17 1/2 x 26 in
Grate area17.4 sq ft
Firebox area93.3 sq ft
Tube heating area947.6 sq ft
Evaporative heating area1,040.9 sq ft
Total heating area1,040.9 sq ft
Calculated Values
steam locomotive
tank locomotive
Douglas Earle Marsh
last changed: 07/2023

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