\r\nThe work will be carried out by Nedtrain at its Haarlem workshops and concerns 242 second and third-generation VIRM cars, equivalent to 24,500 seats.\r\nFollowing tests with a prototype train at the end of 2016, the refurbishment of the fleet of 81 first-generation VIRM sets is now in full-swing at Haarlem, with the programme due to conclude in 2020.\r\nThe refurbishment of the VIRM 2 and 3 trains will follow a similar pattern, and a prototype will be completed in 2020. This train will undergo testing and trials before series overhauls begin.\r\nThe work will include the installation of new accessible toilets in compliance with TSI-PRM (Passengers with Reduced Mobility), full renewal of the interior, new passenger information systems, additional luggage space, LED lighting, and aerodynamic enhancements to reduce energy consumption.\r\nInitially designated DD-IRM, the first trains entered service in 1994 as three and four-car sets. However, soon after delivery, NS ordered additional intermediate cars to extend the trains to four-and six-car formations. These were then designated VIRM.\r\nNS subsequently ordered more trains, with the fleet ultimately comprising 98 four-car and 80 six-car sets. The final train was delivered in 2009.