NS Stadsgewestelijk Materieel

NS Class 2100 / 2900
Sprinter Unit 2983 at Deventer
In service	1975 – present
Manufacturer	Talbot
Number built	90
Formation	2 cars (2100) 3 cars (2900)
Capacity	2100 - 32 (1st), 126 (2nd) 2900 - 40 (1st), 184 (2nd)
Operator(s)	NS Reizigers
Specifications
Maximum speed	120 km/h (75 mph)
Power output	1,280 kW (1,720 hp)
Electric system(s)	1.5 kV DC Catenary
Current collection method	Pantograph
Track gauge	1,435 mm (4 ft 8 1⁄2 in) standard gauge

The Stadsgewestelijk Materieel or SGM (English - Suburban Equipment) is an electric multiple unit (EMU) train type operated by the Dutch railway company Nederlandse Spoorwegen. They were built from 1975 to 1983 by Talbot.

The trains have fast acceleration as distances between stations was short, they needed to be able to speed up and brake quickly. The original idea was for them to be able to operate on the Amsterdam Metro network, so third rail would be needed as well as overhead pick-up, however in 1969 this idea was stopped. Their maximum speed is 125 km/h. The two-car units could accelerate from 0–125 km/h in 72 seconds. Each coach has 3 doors on each side, to allow for quick loading and unloading.

The first batch of 15 were delivered between March and November 1975 and were numbered 2001 - 2015. These were delivered at the same time as the last batches of Plan V stock. These are 2 car units. These were to be used on the Zoetermeer Stadslijn and so did not feature first class, a toilet or a gangway between each coach. 2014 and 2015 were built with different electric traction, but their trial was unsuccessful and so the units were stored for many years, until 2000 when they were fitted with Insulated-gate bipolar transistor.

A total of 60 were ordered in 1977 and started being delivered in September 1978 and finished in 1980. These were numbered 2021 - 2080. These were all delivered as 2 car units. These featured a toilet and a gangway. In 1983 2036 - 2080 were strengthened up to three-car units, with the middle coach featuring a first class section. These were renumbered 2836 - 2880 at the same time.

These were delivered in 1983 directly as three-car units. They were numbered 2881 - 2895. When these were delivered there were 30 two-car units and 60 three-car units.

2027 and 2029 were converted to Spitspendels in 1994. These were used between Rotterdam Centraal and Vlaardingen during the rush hours. During their rebuilding, it was attempted to make the entry and exit faster and to increase the capacity in the train. Many seats were changed to tip up seats and the first class was removed. 2027 also was given an all over advert for the Algemeen Dagblad newspaper.