D class may refer to:

Ships

D-class cruiser (Germany) The D-class cruisers were a pair of German heavy cruisers, classified as ("armored ships") by the (Navy of the Realm). The ships were improved versions of the preceding s, authorized by Adolf Hitler in 1933. They were intended to counter a new ...

, a pair of proposed cruisers * D-class cruiser (United Kingdom), British light cruisers that served during World War II * D-class lifeboat, British lifeboats * D-class destroyer (disambiguation), several classes of ships *

British D-class submarine The D-class submarine was the Royal Navy's first class of submarines capable of operating significantly beyond coastal waters. They were also the first boats to be fitted with wireless transmitters. Ten were laid down between 1907 and 1910, tho ...

United States D-class submarine The United States D-class submarines were a trio of submarines built for the United States Navy in the first decade of the 20th century. All three ships served during World War I providing training for crews and officers on the U.S. East Coast, b ...

* D-class ferry, roll-on/roll-off ferries operated by DFDS Seaways

Rail vehicles

Australia

* MRWA D class, 2-8-0 type steam locomotives *

WAGR D class The WAGR D class was a class of 4-6-4T tank locomotive operated by the Western Australian Government Railways (WAGR) between 1912 and 1964. History In 1911 the WAGR placed an order with the North British Locomotive Company for twenty 4-6-4T lo ...

, 4-6-4T tank locomotive *

WAGR D class (1884) The WAGR D class was a single member class of 0-4-0ST tank locomotive operated by the Western Australian Government Railways (WAGR) from 1884 until 1903. History The D class locomotive was built in 1884 by Hunslet Engine Company, Leeds. It ente ...

, 0-4-0ST tank locomotives *

WAGR D class (diesel) The D/DA class are a class of diesel locomotives built by Clyde Engineering, Granville for the Western Australian Government Railways in 1971-1972. History Five D class were ordered by the Western Australian Government Railways to haul bauxite ...

, diesel locomotives *

D-class Melbourne tram The D-class Melbourne tram is a fleet of Low-floor tram, low-floor Siemens Combino, Combino trams that operate on the Trams in Melbourne, Melbourne tram network. They were built by Siemens Mobility, Siemens in Uerdingen, Krefeld, Germany, and a ...

* D-class Sydney tram

India

DHR D Class The DHR D Class was a gauge Garratt-type articulated steam locomotive used on the Darjeeling Himalayan Railway (DHR) in West Bengal, India. Service history The sole member of the class was built by Beyer, Peacock & Company, Manchester, England ...

, 0-4-0+0-4-0 Garratt-type articulated steam locomotives

New Zealand

NZR D class (1874) NZR D class steam tank locomotives operated on New Zealand's national railway network. The first entered service in 1874 all had been withdrawn by the end of 1927, which allowed the D classification to be used again in 1929. Introduction ...

, 33 2-4-0T tank locomotives *

NZR D class (1929) The NZR D class of 1929 comprised one 0-4-0 tank locomotive that was built for the New Zealand Railways Department by the Clayton Wagons Ltd in Lincoln, England. History D 1 was purchased for railcar-type service, but it was not successful. I ...

, 1 experimental 0-4-0T locomotives

United Kingdom

Metropolitan Railway D Class The Metropolitan Railway D Class was a group of six locomotives built for the Metropolitan Railway in 1894-1895 by Sharp, Stewart and Company. Overview Two locomotives were used on the Verney Junction-Aylesbury section. The other four ran betw ...

, tank engines *

NBR D class 0-6-0T The NBR D Class (LNER Class J83) was a class of 0-6-0 tank locomotives designed by Matthew Holmes for short distance freight, station pilot, and heavy shunting duties on the North British Railway. Service history They were introduced in 1900 a ...

, tank locomotives *

LNWR Class D The London and North Western Railway (LNWR) Class D was a class of steam locomotives. They were simple engine rebuilds of earlier Webb Class A three-cylinder compound engines. History Though the original rebuilds of the Class As had reused t ...

, 0-8-0 steam locomotives *

SECR D class The SECR D class is a class of 4-4-0 tender locomotives designed by Harry Wainwright for the South Eastern and Chatham Railway. Overview The construction of the initial 20 engines was shared between Ashford railway works and the Glasgow buil ...

, 4-4-0 tender locomotives

Other uses

D-class blimp The D class blimp was a patrol airship used by the US Navy in the early 1920s. The D-type blimps were slightly larger than the C-type and had many detail improvements. The Navy continued the practice of dividing the envelope production between G ...

, United States Navy blimps *

D-segment The D-segment is the 4th category of the Euro Car Segment, European segments for passenger cars, and is described as "large cars". It is equivalent to the Euro NCAP "large family car" size class, and the present-day definition of the mid-size ...

, a European vehicle size class * D-class personnel, disposable human test subjects in the fictional

SCP Foundation The SCP Foundation is a fictional organization featured in stories created by contributors on the SCP Wiki, a wiki-based Collaborative fiction, collaborative writing project. Within the project's shared universe, shared fictional universe, the ...