What is British Rail Class D3/6?
{{Infobox Locomotive |name = British Rail Class D3/6 |powertype = Diesel-electric |image = |caption = |roadnumber = LMS 7069–7079;<br>BR 12000–12002 |builder = [[English Electric]] at [[Hawthorn Leslie]] |serialnumber = HL: 3841–3850, 3816 |builddate = 1934 (1), 1935 (10) |totalproduction = |gauge = {{RailGauge|ussg|lk=on|al=on}} |primemover = [[English Electric diesel engines|English Electric 6K]] |tractionmotors = English Electric, 2 off |whytetype = 0-6-0 DE |uicclass = C |wheeldiameter = {{convert|4|ft|0+1/2|in|m|3|abbr=on}} |minimumcurve = |trainbrakes = |locobrakeforce = |wheelbase = |length = |width = |height = |locoweight = {{convert|51.45|LT|lk=on}} |topspeed = {{convert|30|mph|km/h|0|abbr=on}} |poweroutput = ''Engine:'' {{convert|350|hp|kW|0|abbr=on|lk=on}} |tractiveeffort = {{convert|30000|lbf|kN|1|abbr=on|lk=on}} |fuelcap = |trainheating = None |multipleworking = Not fitted |axleloadclass = [[Route availability]] 5 |railroad = [[London, Midland and Scottish Railway]],<br>[[War Department (UK)|War Department]],<br>[[British Railways]] |railroadclass = LMS: 0F; BR: D3/6 |retiredate = |disposition = }} '''Class D3/6''' were diesel shunters built in 1935 by [[English Electric]] for the [[London, Midland and Scottish Railway]]. They were the first of a new design of diesel shunters based on the English Electric 6K of 350&nbsp;hp diesel engine. One demonstrator and ten production locomotives were built, numbered 7079 and 7069-7078 by the LMS. Three of these later became [[British Rail]] numbers 12000–12002 (previously 7074/76/79 respectively). The remainder were sold to the British [[War Department]] in 1940 and were shipped to France during [[World War II]]. Of these the first production locomotive, no. 7069, survived the war and was used in industrial service in [[France]]. It was later repatriated for preservation and is now based at the [[Gloucestershire Warwickshire Railway]]. {{British Rail Locomotives}} {{transport-stub}} [[Category:London, Midland and Scottish Railwa