MS 61

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "MS 61" – news · newspapers · books · scholar · JSTOR (July 2015) (Learn how and when to remove this message)

You can help expand this article with text translated from the corresponding article in French. (September 2018) Click [show] for important translation instructions. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing French Wikipedia article at [[:fr:MS 61]]; see its history for attribution. You may also add the template {{Translated|fr|MS 61}} to the talk page. For more guidance, see Wikipedia:Translation.

MS 61
Refurbished MS 61 train
Interior
In service	29 June 1967–16 April 2016[1]
Manufacturer	ANF, Brissonneau et Lotz and CIMT [fr]
Constructed	1966 for first train
Refurbished	1985–1992 2005–2008 (partial rebuild)
Scrapped	2016
Number built	127 units + 1 trailer
Number preserved	1 unit (2010)
Formation	3 cars per trainset
Capacity	292 seats per unit (200 fixed and 92 flip-up)
Operators	RATP
Depots	Sucy-en-Brie Rueil-Malmaison Torcy
Lines served	(1969–2016) (1967–1983)
Specifications
Train length	73.22 m (240 ft 3 in)
Car length	Motor: 24.555 m (80 ft 6.7 in) Trailer: 24.110 m (79 ft 1.2 in)
Width	2.91 m (9 ft 7 in)
Height	4.28 m (14 ft 1 in)
Floor height	1.24 m (4 ft 1 in)
Doors	4 pairs per side, per car
Wheel diameter	1.05 m (3 ft 5 in)
Wheelbase	Motor: 2.6 m (8 ft 6 in) Trailer: 2.2 m (7 ft 3 in)
Maximum speed	100 km/h (62 mph)
Weight	148 tonnes
Traction system	Cam switch JH (Jeumont Heidmann)
Traction motors	8x Oerlikon HMW 48 motors
Power output	1,600 kW (2,100 hp)
Acceleration	2.8 km/(h⋅s) (1.7 mph/s)
Deceleration	5.0 km/(h⋅s) (3.1 mph/s) (emergency brake)
Electric system(s)	Overhead line, 1,500 V DC
Current collector(s)	Pantograph type AM 44
Bogies	twin engine, welded frame, spring suspension
Braking system(s)	Disc and dynamic(rheostatic)
Safety system(s)	SACEM
Coupling system	Scharfenberg type
Multiple working	MS61 (3 trainsets in operation)
Headlight type	Head: Halogen Tail: LED
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Notes/references
Source: RATP (1996). This infobox shows the latest status before this train was withdrawn.

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)^[2] 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 entered 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.