VIRM trains, full name Verlengd InterRegio Materieel (Lengthened interregional rolling stock), are a series of electric multiple unit (EMU) double-deck trains operated by Nederlandse Spoorwegen or NS (Dutch Railways), the principal railway operator in the Netherlands. NS has 178 of these double-deckers – 98 four-carriage sets, and 80 six-carriage sets. The trains were built between 1994 and 2009 – for the most part by Talbot, part of Bombardier Inc., with some railcars built by De Dietrich.