NS Intercity Materieel

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NS Class 4000/4200
A refurbished set approaching Alphen aan den Rijn
Refurbished second class interior
Stock type	Electric multiple unit
In service	1977 – present
Manufacturer	Talbot
Number built	144
Formation	3 cars (4000) 4 cars (4200)
Capacity	4000: 35 (1st), 163 (2nd) 4200: 59 (1st), 198 (2nd)
Operators	NS Reizigers
Specifications
Maximum speed	In service: 140 km/h (87 mph) Design: 180 km/h (110 mph)
Traction system	0/1: Resistors 2/3/4: Holec thyristor chopper
Power output	4000: 1,248 kW (1,674 hp) 4200: 1,872 kW (2,510 hp)
Electric system(s)	1.5 kV DC Catenary
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge

The Intercity Materieel or ICM (lit. transl. Intercity Material – transl. Intercity Rolling Stock) is an electric multiple unit (EMU) train type operated by the Nederlandse Spoorwegen in the Netherlands. The train received the nickname Koploper, because it had a so-called "walk through head". After these trains were modernized, the "walk through heads" were removed. The modernized train sets are referred to as Intercity Materieel Modern (ICMm).

The prototypes were built in 1976, with full-scale production lasting from 1983 to 1994 by Talbot. The first train sets came into service in 1977. The trains run daily on the Dutch rail network and, together with the VIRM, form the most important equipment on services connecting the Randstad with the rest of the country.