|This unit, NºS10 was an Instructional train that was
made up in 1956 from 4 Sub coaches. Consisting of coaches DS40 to DS42,
it was vestibuled with, in the first coach, a Motorman's and Guard's
compartment, a lecture room and a projection room. The second coach contained
samples of all kinds of power control equipment with the third being devoted to
power collection, lighting and heating equipment, plus another Motorman's
compartment. Photographed here in April 1969, the unit was subsequently
bibliography: Service Stock of the Southern Railway, R W Kidner
photograph: Mike Morant collection
|Text by John Atkinson.
|The coaches which later comprised the 'Instruction
Unit' started their EMU lives in August 1930 as one of the 'additional
units' batch numbered 1773 to 1785. These were ordered to HO553 dated
1st February 1930 for ten additional units (though this order also included the
final three units of the previous batch (1770 - 1772) and was followed by HO584
placed later in 1930 which added three more units to this batch (1783 - 1785)
and also units 1786 - 1794 of the next batch (these had different compartment
Units 1773 - 1782 used ex LSWR bogie-block suburban stock as the source of their bodies (these being from the same batches as those used many years earliier for the first LSWR units 1201 - 1284) and nearly all were mounted onto new SR 62' 0" standard underframes from Lancing. However, five underframes used were lengthened ex LBSC 'AC' electric frames, two odd frames being used under one motorcoach each of units 1780 & 1781, whilst all three coaches of1782 were mounted on this type of underframe.
The layout of these units was:-
The MBT was converted from a 51' Brake Third with a new cab (9' 1" deep) and van area (8' 5" wide) added at the former brakevan end of the old body. Each compartment was 5' 6" wide and the coach was finished to Diagram 671. It weighed 39 tons, 14cwt and seated 80 Third.
The TC was converted from a 51' Bi-Composite with two additional third compartments added to one end of the old body. The four first class compartments were 6' 6" wide and the adjacent four thirds were 6' 0" wide whilst the two new ones were 5' 5 1/8" wide. This coach was to Diagram 760 and it weighed 26 tons and seated 32 first and 60 third.
The MBC was converted from a 49' Tri-Composite, again with a new cab (9' 1" deep) and van area 10' 0 11/16" wide added to one end, whilst a comptment was removed from the other end of the body during conversion. Each first compartment was 6' 6" wide and three thirds were 5' 10" wide with one at 5' 6" adjacent to the brakevan. This coach was to Diagram 697 and weighed 39 tons 14cwt and seated 24 first and 40 third.
Overall therefore unit 1782 weighed 109 tons and seated 56 first and 180 third and was 193' 8" long. The bodywork conversions were carried out at Eastleigh and the part completed unit the taken to Brighton where electrical equipment was installed. Unit 1782 went into traffic in August 1930 and was formed MBT 8564 + TC 9658 + MBC 9817.
Coach origins were as follows:-
Unit 1782 then ran as such until it was augmented to 4 Sub in October 1947. I have no record of any temporary reforms whilst it was a three coach motor unit. As augmented, unit 1782 became unit 4579, this having a bulleid-style six-aside 'tin trailer' added, numbered 10460. This new coach had 10 compartments of six-aside seating and therefore seated 120 third and weighed 28 tons. They were to Diagram 2013. In four car form therefore unit 4579 was 257' 5" long overall and seated 370 third (the first class now being downgraded to third and regarded as seating five-aside). Unit 4579 weighed 137 tons.
Unit 4579 ran as such until disbanded 14th August 1953 when TS
10460 was removed and converted to electro-pneumatic braking, renumbered 15033
and included in new 4 EPB unit 5033 from September 1953. Both MBTs were stored
and trailer 9658 went into unit 4520 for a while, but was removed again in
October 1954 and stored along with the motorcoaches. All three coaches were
then converted into Instruction Unit S10, the coaches being renumbered as
Here are a few records of its movements:-
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This page was created 5 December 2003