MS 61

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The MS 61 (French: Matériel Suburbain de 1961, English: Suburban rolling stock of 1961) was an electric multiple unit trainset that was operated on line A and line B of the Réseau Express Régional (RER), a hybrid suburban commuter and rapid transit system serving Paris and its Île-de-France suburbs. The MS 61 borrowed many elements from the Z 23000 railcars built for the Ligne de Sceaux (a predecessor of the RER B), including four pairs of doors on each side of the cars for fast boarding of passengers at stations, but the MS 61 was capable of speeds of up to 100 km/h (62 mph) compared to 80 km/h (50 mph) for the Z 23000. Unlike later rolling stock for the RER lines, the MS 61 lacked dual-voltage capabilities and could only use the RATP's 1.5 kV DC electrical system, limiting them to only operating between Saint-Germain-en-Laye and Boissy-Saint-Léger or Marne-la-Vallée–Chessy on the RER A and between Gare du Nord and Robinson or Saint-Rémy-lès-Chevreuse on the RER B. The MS 61 trains first started service on 29 June 1967 on the RER B and were removed from the line on 28 February 1983 after the delivery of the MI 79 and MI 84 dual-voltage trainsets. The MS 61 trains began operation on the RER A on 14 December 1969 where they remained in service until 16 April 2016 after gradually being replaced by the MI 2N and MI 09 series of dual-voltage, higher capacity (double-decker) trains.