The concessions will start in December 2020 and expire in December 2035, and will follow on from the existing concessions which Arriva has had since 2005. The concessions cover lines radiating from Groningen to Leer, Germany, Veendam, Delfzijl, Roodeschool and Leeuwarden, and from Leeuwarden to Stavoren and Harlingen Haven.\r\nIn the new concession Arriva will increase train frequency and provide more seats to passengers. The number of fast trains between Leeuwarden and Groningen will double from one to two per hour and be extended to Groningen Europark, while night trains will be introduced on Thursdays and Fridays. Fast trains will be introduced in peak hours between Groningen and Winschoten, and a 15-minute-interval service will be introduced between Leeuwarden and Sneek on the Stavoren line.\r\nThe Groningen - Leer service, which has been suspended since a ship damaged the Friesen bridge over the River Ems in Germany, will be restarted as an hourly service and will call at the recently reopened stations of Ihrhove and Bunde in Germany. At Leer, good connections will be provided with long-distance trains.\r\nArriva\u2019s current fleet of 48 Stadler GTW DMUs will be refurbished and will be augmented by 21 additional trains, of which 18 will be new. Arriva is expected to confirm an order shortly with Stadler for Flirt DMUs to be known as Flirtino.\r\nArriva says it \u201cattached significant importance to delivering a more sustainable, environmentally-friendly transport network in its bid.\u201d It says the existing fleet will be converted to energy-saving, emissions-lowering hybrid trains, and the 18 new trains will be powered by biodiesel. In the long term, a complete conversion of its trains to emission-free electric operation is planned.\r\nThe new trains will make use of battery technology to regenerate energy from braking. This will make it possible to switch off the diesel engines when the trains are idle for more than 5 minutes. Arriva aims to reduce CO2 emissions by 2%.\r\nCounters installed at train doors to monitor the number of passengers boarding and alighting will be used to help passengers find a seat. An App will be developed to assist passengers when train services are replaced by busses, and Arriva says busses will be available more quickly than now. Bicycles will be available for passengers to use at every station served by Arriva.