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District line
The District line is a London Underground line running east to west across London from Upminster to Ealing Broadway, Richmond, and Wimbledon, serving 60 stations.
Docklands Light Railway
The Docklands Light Railway (DLR) is an automated light rail system in east and south-east London, owned by Transport for London and operated by KeolisAmey Docklands since 1987.
Docklands Light Railway B23 Stock
The Docklands Light Railway B23 Stock is the fourth generation of train on London's DLR: 54 five-car CAF trains that entered service in 2025 and replace the oldest rolling stock.
Docklands Light Railway B90, B92, and B2K Stock
The DLR B90, B92, and B2K stock are articulated light rail vehicles built by Bombardier in Belgium for London's Docklands Light Railway between 1991 and 2002.
Docklands Light Railway rolling stock
The Docklands Light Railway rolling stock is the driverless electric multiple units serving London's DLR since 1987, from the original LHB P86 to the new CAF B23 trains.
Doha Metro (مترو الدوحة)
Doha Metro (مترو الدوحة) is a fully automated, driverless rapid transit system serving Doha, Qatar, operated by Qatar Rail with three lines covering 76 kilometers and 37 stations.
Dome car
A dome car is a railroad passenger car with a raised, glass-enclosed observation compartment in the roof, offering panoramic views; the type originated in the United States in the mid-1940s.
Doncaster Works
Doncaster Works, also known as Doncaster Railway Works and locally as "The Plant", is a railway engineering works in Doncaster, South Yorkshire, founded by the Great Northern Railway in 1853.
Double Decker Express
The Double Decker Express is a class of Indian Railways express trains with air-conditioned double-decker coaches seating passengers on two levels, introduced from October 2011.
Double-stack rail transport
Double-stack rail transport loads intermodal shipping containers two high on well cars, roughly doubling containers carried per railcar and cutting crews, fuel, and train paths.
Downtown MRT line
The Downtown MRT line, or DTL, is a fully underground, driverless MRT in Singapore. It runs 42 km from Bukit Panjang to Expo, serving 35 stations and 11 interchanges.
Downtown Seattle Transit Tunnel
The Downtown Seattle Transit Tunnel, also known as the Seattle Transit Tunnel, is a 1.3-mile bus and light rail tunnel under downtown Seattle, opened in 1990.
DR Class 243
DR Class 243 was a universal electric locomotive of the East German Deutsche Reichsbahn, built by LEW Hennigsdorf from 1984 to 1991 with a top speed of 120 km/h.
DR Class 250
The DR Class 250, renumbered DB Class 155 after German reunification, was a heavy six-axle electric freight locomotive built by LEW Hennigsdorf for East Germany's Deutsche Reichsbahn.
DR Class 52.80
The DR Class 52.80, or Rekolok 52.80, is a German steam locomotive rebuilt from 200 wartime Class 52 engines in East Germany between 1960 and 1967.
DR Class V 100
The DR Class V 100 was a family of diesel-hydraulic locomotives built for the East German Deutsche Reichsbahn from 1966, with 1,146 units replacing steam in light and medium service.
Draisine
A draisine, also called a rail bike or velorail, is a small hand- or motor-powered rail vehicle used by railway workers for track inspection and maintenance.
DRB Class 42
The DRB Class 42 (PKP class Ty3 and Ty43) was a German heavy freight wartime steam locomotive of the Deutsche Reichsbahn, with 1,061 built from 1943 to 1949.
DRB Class 50
The DRB Class 50 (Baureihe 50, BR 50) was a German standard-design freight steam locomotive built from 1939 for the Deutsche Reichsbahn, with 3,164 examples built.
DRB Class 52
The DRB Class 52, also known as DRG BR 52, was a simplified German 2-10-0 wartime steam freight locomotive, of which about 7,000 were built from 1942.
DRG Class 01
DRG Class 01, also known as DRG BR 01, is a German standard express passenger steam locomotive with a Pacific wheel arrangement, 231 built between 1925 and 1938.
DRG Class 05
DRG Class 05 comprised three experimental streamlined express steam locomotives built by Borsig for the Deutsche Reichsbahn between 1935 and 1937; one set a world steam speed record of 200.4 km/h in 1936.
DRG Class 44
The DRG Class 44 (Baureihe 44) was a German three-cylinder 2-10-0 heavy freight steam locomotive nicknamed Jumbo, built from 1926 to 1949 in 1,989 examples and running until the end of steam in Germany.
DRG Kleinlokomotive Class II
The DRG Kleinlokomotive Class II, also known as Köf II, is a standardized German light shunting locomotive developed from 1932, with over 1,100 built and about 180 preserved today.
Driving wheel
A driving wheel, or coupled wheel, is a powered locomotive wheel that receives torque from the pistons or turbine and transmits it to the rail.
DSB (railway company)
DSB (Danske Statsbaner) is the Danish state-owned passenger railway company, founded in 1885. It operates long-distance and regional trains across Denmark, the Copenhagen S-train network, and international services to Germany.
DSB Class MZ
The DSB Class MZ is a class of 61 Co-Co diesel-electric locomotives built by NOHAB in Sweden for the Danish State Railways between 1967 and 1978.
Dual gauge
Dual gauge, also called mixed gauge or twin gauge, is railway track carrying trains of two different wheel gauges, usually by laying three rails, used in Australia, Spain, and Switzerland.
Dubai Metro (مترو دبي)
Dubai Metro, or مترو دبي, is a fully automated, driverless rapid transit network in Dubai, United Arab Emirates, opened in 2009 and operated by the Roads and Transport Authority.
Duplex locomotive
A duplex locomotive, also called a duplex drive locomotive, is a steam locomotive with two engine units on one rigid frame, first built in America in 1937.