The Class 91 is a type of electric multiple unit currently operating on Keretapi Tanah Melayu's Electric Train Service (ETS) since 2009. In 2008 KTMB purchased a total of 5 sets of 6 car EMUs worth RM 240 million ringgit or $67 million (USD) from a joint venture between South Korea's Rotem Co. and Japan Mitsubishi Electric Corp. These cars are arranged in a 6-cars configuration for a total of 5 train sets.