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The 2D2 5500 were
This class originated on the PO with the two class locomotives of 1925. These had four 
Thirty five units were ordered by the PO to run on its newly electrified Paris-Orleans-Toulouse/Bordeaux lines, numbers 503 to 537, delivered between 1933 and 1935. The next 15 locomotives were delivered until 1943 to the PO.
The units travelled between overhauls. They were known to be very low vibration locomotives.
electric locomotive
An electric locomotive is a locomotive powered by electricity from overhead lines, a third rail or on-board energy storage such as a Battery (electricity), battery or a supercapacitor. Locomotives with on-board fuelled prime mover (locomotive), ...
s operated by the Compagnie du chemin de fer de Paris à Orléans
The ''Compagnie du chemin de fer de Paris à Orléans'' (, PO) was an early French railway company.
It merged with the '' Chemins de fer du Midi'' to form the '' Chemins de fer de Paris à Orléans et du Midi'' (PO-Midi) in 1934. In 1938 the PO ...
, then SNCF
The Société nationale des chemins de fer français (, , SNCF ) is France's national State-owned enterprise, state-owned railway company. Founded in 1938, it operates the Rail transport in France, country's national rail traffic along with th ...
in France, in operation from 1933 to 1980.
Design and operation
This class originated on the PO with the two class locomotives of 1925. These had four traction motor
A traction motor is an electric motor used for propulsion of a vehicle, such as locomotives, electric vehicle, electric or hydrogen vehicles, or electric multiple unit trains.
Traction (engineering), Traction motors are used in electrically powe ...
s, one per axle, driving through Buchli drive
The Buchli drive is a transmission system used in electric locomotives. It was named after its inventor, Swiss engineer Jakob Buchli. The drive is a fully spring-loaded Vehicle propulsion, drive, in which each floating axle has an individual moto ...
s and following Swiss practice. They were considered to be more reliable in service than other PO electric locos.
The locomotives operated from a catenary with two pantographs, powering four motors. Each locomotive had over of wire for the series-wound electric motors. The driver would start the engines in series
Series may refer to:
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* Caroline Series (born 1951), English mathematician, daughter of George Series
* George Series (1920–1995), English physicist
Arts, entertainment, and media
Music
* Series, the ordered sets used i ...
, with only voltage applied at 350 A. The resistance applied to the engines was progressively removed and the locomotive's speed increased, then switching to series-parallel operation and finally parallel only at . Rheostatic braking
Dynamic braking is the use of an electric traction motor as a generator when slowing a vehicle such as an electric or diesel-electric locomotive. It is termed " rheostatic" if the generated electrical power is dissipated as heat in brake grid re ...
was also possible, with the rotors connected in series and shunt resistances across each field winding. Engineers watched the line ahead through a circular frosted lens in the windshield.
Thirty five units were ordered by the PO to run on its newly electrified Paris-Orleans-Toulouse/Bordeaux lines, numbers 503 to 537, delivered between 1933 and 1935. The next 15 locomotives were delivered until 1943 to the PO.
The units travelled between overhauls. They were known to be very low vibration locomotives.
Service history
A 1946 SNCF film shows 2D2 5550 travelling on the Paris-Le Mans line, noting that 2D2 units delivered before 1942 had over travelled, some over . Post-war, the Paris-Lyon line was electrified and an improved 2-Do-2 class, the was ordered. 35 of these were delivered by 1950, but after this therigid-framed electric locomotive
Rigid-framed electric locomotives were some of the first generations of electric locomotive design. When these began the traction motors of these early locomotives, particularly with AC motors, were too large and heavy to be mounted directly to th ...
was replaced by a Co-Co bogie
A bogie ( ) (or truck in North American English) comprises two or more Wheelset (rail transport), wheelsets (two Railroad wheel, wheels on an axle), in a frame, attached under a vehicle by a pivot. Bogies take various forms in various modes ...
design, the CC 7100.
Preservation
2D2 5516 is preserved at Cite du Train. It was put in service in July 1933 and retired in 1978, having travelled over .Notes
References
* {{SNCF locos Standard gauge electric locomotives of France SNCF locomotives 2′Do2′ locomotives 1500 V DC locomotives Fives-Lille locomotives CEM locomotives Passenger locomotives E.0501