page_title: British Rail Class 50
section_title: Portuguese locomotives
hierarchical_section_title: British Rail Class 50 / Portuguese locomotives
caption_attribution_description: En route from Barriero to Vila Real de Santo António on 27 November 1990, 1805 pauses at Ermidas Sado where it was booked to cross over with a northbound train.
context_page_description: The British Rail Class 50 is a class of diesel locomotives designed to haul express passenger trains at 100 mph. Built by English Electric at the Vulcan Foundry in Newton-le-Willows between 1967 and 1968, the Class 50s were initially on a 10-year lease from English Electric Leasing, and were employed hauling express passenger trains on the, then non-electrified, section of the West Coast Main Line between Crewe and Scotland. Initially numbered D400 - D449 and known as English Electric Type 4s, the locomotives were purchased outright by British Rail at the end of the lease and became Class 50 in the TOPS renumbering of 1973. The class gained the nickname "Hoovers" because of the noise made by the clean air plant at the No.2 end, prior to refurbishment, which was likened to that of a vacuum cleaner, a name believed given to them by the staff at Paddington Station. Once the electrification from Crewe to Glasgow was completed the locomotives were moved to the Great Western Main Line out of Paddington to allow the retirement of most of the remaining diesel-hydraulic locomotives then in use.
context_section_description: The Portuguese Railways, CP, bought ten locomotives similar to the BR Class 50, but built to Iberian track gauge (1,668 mm). These locomotives, designated by CP as "Série 1800" (numbered 1801–1810), entered service in 1968.
  Like the British Class 50s, they were equipped with an English Electric 16 CSVT engine and produced 2700 hp (2020 HP at the wheels). Unlike the BR locomotives upon which electronic control is extensively used, the Portuguese locomotives employ conventional control gear (the only exceptions being stepless control of tractive effort by a solid-state load regulator and the use of a very effective out-of-balance wheel-slip detector). The main generator and the traction motors are identical to those used on the BR Type 3 and Deltic locomotives. Contrary to BR Class 50, the Portuguese Série 1800 locomotives were built to be as much compatible with the smaller Série 1400 (themselves similar to BR Class 20) as possible and also to use as many common components as possible.
  They were the only diesel locomotives in Portugal authorised to run at 140 km/h. The CP Série 1800s were all withdrawn in 2001 and (as of 2012) several have been cut up, and the future of the rest is unclear. Today some of these locomotives are still mostly seen as freight trains rather than passenger trains.
  Locomotive 1805 has been preserved in operational condition by the Portuguese National Railway Museum at Entroncamento. Since the 1980s it had been painted in CP's corporate orange livery; it has been repainted in its original distinctive blue livery by the CP workshop at Contumil near Porto. While still an integral part of the National Railway Museum, is set to return to service pulling tourist trains in the Douro River Line.
caption: En route from Barreiro to Vila Real de Santo António on 27 November 1990, 1805 pauses at Ermidas Sado where it was booked to cross over with a northbound train.
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