Class S1 was a fleet of Diesel Multiple Units (DMU) built by English Electric for the Ceylon Government Railways (CGR), imported to Sri Lanka in 1937-8. Initially designated as D1, D2 and D3 they were later classified as Class S1 under the re-classification of loco rolling stock in 1938. Three sets were numbered 501, 502, 503 and they were named as:
1. Silver Foam (#501),2. Silver Spray (#502) and
3. Silver Mist (#503)
They were the first diesel units imported for passenger haulage with the first run done on 25 February 1938. Commercial runs from Colombo Fort to Galle commenced on 14 March 1938 with a journey time of 2 hrs and 13 minutes which is the same time as today.
These sets had two engines of 180hp (135 kWh) each in the front and back. The normal make-up of the train units comprised a power car at each end in a push-pull configuration with two unpowered trailer cars in between.
Reports are that it went on a trial up to Kandy by removing one of the two trailer cars in between (thus two power cars and one trailer car).
The S1 series trains were in service until the early 1950s before being withdrawn in the 1954-56 era and scrapped subsequently.
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