The NS Mat '64 or Materieel '64 were electric multiple units (EMU) built by Werkspoor and later by Duewag and Waggonfabrik Talbot between 1961 and 1976. They were operated in the Netherlands by the Nederlandse Spoorwegen (NS) until 2016. The equipment consisted of independent four and two-car train sets called Plan T and Plan V: the Plan T is a 4-car EMU, and the Plan V is a 2-car EMU. Materieel '64 is sometimes nicknamed 'Apekoppen' and 'Standaard Stoptrein' due to their distinct shape.

Werkspoor N.V. was the shortened, and later the official name of the Nederlandsche Fabriek van Werktuigen en Spoorwegmaterieel. It was a Dutch machine factory, known for rolling stock, (ship) steam engines, and diesel engines. It was a successor of the company Van Vlissingen en Dudok van Heel, later named Koninklijke Fabriek van Stoom- en andere Werktuigen. In 1954 Werkspoor was merged with Stork.