MS 61

MS 61
Refurbished MS 61 train
Interior
In service	29 June 1967 – 16 April 2016
Manufacturer	Brissonneau et Lotz ANF CIMT
Refurbishment	1985–1992 2005–2008 (partial rebuild)
Number built	127 units + 1 trailer
Number preserved	1 unit (2010)
Capacity	292 seats per unit (200 fixed and 92 tip-up)
Operator(s)	RATP
Line(s) served	(1969–2016) (1967–1983)
Specifications
Track gauge	1,435 mm (4 ft 8 1⁄2 in)

MS 61 (MS meaning Matériel Suburbain in French) was a series of single-decker electric multiple units that operated on the RATP-owned sections of the RER A, between Saint Germain-en-Laye and Boissy-Saint-Léger or Marne-la-Vallée – Chessy.

MS 61 trains first entered service on 29 June 1967, and although this was the first type of fleet to be produced directly for the RER project, it is currently the second-oldest in the network at present, after the Class Z 5300 (which entered service in 1965, and currently operates on a section of the RER D between Juvisy and Melun).

The MI 09 series replaced the MS 61 series between 5 December 2011 and 16 April 2016.

The MS 61 series was built before the RER came into existence on 8 December 1977: a total of 127 units and one spare trailer were built by Brissonneau et Lotz, ANF and CIMT for the RATP from 1963.

The manufacturers constructed a total of six types for the MS 61 series: A, B, C, D, E and Ex. Types A and B had three-panelled windows for the front, while the remainder were similar to the MF 67 for the Paris Métro.

In passenger service, the MS 61 series usually runs in two or three pairs (6 or 9 cars), depending on the timetable. It is possible for them to run as a single pair, although it rarely does in passenger service.

MS 61 trailers formerly had a first class section: Syndicat des Transports Parisiens (STP, now STIF) abolished first class travel on 1 September 1999, and the bulkheads that divided the first and second class sections were removed in the second refurbishment.