British Rail Class D2/7

{{Use dmy dates|date=February 2025}}

{{Use British English|date=December 2016}}

{{Infobox locomotive

|name = British Rail Class D2/7

|powertype = Diesel-mechanical

|image = Hudswell D707 at the Rutland Railway 05-09-25 31.jpeg

|caption = Locomotive shown in 2005.

|fleetnumbers = 11116–11120, 11144–11148; D2500–D2509 from 1958 to 1962

|builder = Hudswell Clarke

|serialnumber = D898–D902, D938–D942

|builddate = 1955–1956

|gauge = {{Track gauge|ussg|allk=on}}

|primemover = Gardner 8L3

|transmission = Mechanical, SSS Powerflow three-speed gearbox

|whytetype = 0-6-0 DM

|uicclass = C

|wheeldiameter = {{convert|3|ft|6|in|m|3|abbr=on}}

|minimumcurve =

|trainbrakes = None

|locobrakeforce =

|wheelbase =

|length =

|width =

|height =

|locoweight= {{convert|36.35|LT|t ST|lk=on}}

|maxspeed = {{convert|14|mph|km/h|0|abbr=on}}

|poweroutput = Engine: {{convert|204|bhp|kW|abbr=on|lk=in}}

|tractiveeffort = {{convert|16100|lbf|kN|1|abbr=on}}

|fuelcap =

|trainheating = None

|multipleworking = Not fitted

|axleloadclass = Route availability 4

|operator = British Railways

|operatorclass = D2/7; later 2/14; no TOPS class

|retiredate = 1967

|disposition = All scrapped

}}British Rail Class D2/7 was a locomotive commissioned by British Rail in England. It was a diesel powered locomotive in the pre-TOPS period built by Hudswell Clarke with a Gardner engine. The mechanical transmission, using a scoop control fluid coupling and three-speed Power-flow SSS (synchro-self-shifting) gearbox,{{Cite web|url=http://www.dmm.org.uk/colleng/4805-01.htm|title=Durham Mining Museum – Colliery Engineering|website=dmm.org.uk}} was a Hudswell Clarke speciality.