British Rail DHP1

{{notability|date=July 2024}}

{{Use dmy dates|date=December 2016}}

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

{{Infobox Locomotive

|name = Clayton DHP1

|powertype=Diesel-hydraulic

|image =

|caption =

|builder = Clayton Equipment Company

|builddate = 1962-1963

|serialnumber = 4337U1

|totalproduction = 1

|transmission = Hydraulic

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

|uicclass = B'B'

|Britishclass = B-B

|wheeldiameter = {{convert|3|ft|3+1/2|in|m|3|abbr=on}}

|minimumcurve = {{convert|4|chain|ft m|lk=in}}

|trainbrakes = Vacuum

|wheelbase = {{convert|34|ft|0|in|m|2|abbr=on}}

|length = {{convert|46|ft|3+1/2|in|m|2|abbr=on}}

|width = {{convert|9|ft|0|in|m|2|abbr=on}}

|height = {{convert|12|ft|6|in|m|2|abbr=on}}

|locoweight = {{Convert|56|LT|t ST}}

|maxspeed = {{Convert|90|mph|abbr=on}}

|primemover = Rolls-Royce C8TFL, 4 off

|poweroutput = Engines: {{Convert|375|hp|abbr=on|lk=in}} at 1,800 rpm × 4
At rail: {{Convert|1200|hp|abbr=on|lk=in}}

|tractiveeffort = Maximum: {{convert|37500|lbf|kN|sigfig=3|abbr=on|lk=on}}

|fuelcap = {{convert|600|impgal|abbr=on}}

|trainheating = Steam

|multipleworking = Not fitted

|operator = British Railways

|disposition = Scrapped

|notes = {{cite web |url=http://www.therailwaycentre.com:80/trc_new_logos/MTLD%20advert-web.pdf |title=The Complete UK Modern Traction Locomotive Directory |last= |first= |date=1 November 2011 |website=www.therailwaycentre.com |publisher= |access-date=28 September 2024 |quote= |archive-date=24 July 2011 |archive-url=https://web.archive.org/web/20110724164205/http://www.therailwaycentre.com:80/trc_new_logos/MTLD%20advert-web.pdf }}{{Additional citations needed|date=September 2024|reason=The archived PDF did not give all the details in the infobox and might even contradict it.}}

}}

DHP1, meaning Diesel Hydraulic Prototype number 1, was a prototype Type 3 mainline diesel locomotive built between 1962 and 1963 by Clayton to demonstrate their wares to British Railways.{{Cite news |date=January 2021 |title=Clayton Building on Success |url=https://claytonequipment.co.uk/wp-content/uploads/2018/02/Railways-Illustrated-Magazine.pdf |work=Railways Illustrated |pages=50–51}} It was designed for mixed traffic work, being equipped with steam heating facilities for working passenger trains.{{Citation needed|date=September 2024}} It was painted red, with the cab area above bonnet-level height painted cream.

Visually similar to their Class 17 Type 1 product, though longer, and with the radiator grilles in the ends of the engine covers rather than the sides. The locomotive saw little service, mainly around the International Combustion works in Derby. The locomotive was broken up by Clayton's in April 1967.