had been built a few years prior. It was the first rolling stock with the later frequently used swivel doors. The Scharfenberg coupler allows the train to travel as a consist, but not with other rolling stock. A notable difference between Plan T and Plan V is the number of train carriages: four (Plan T) and two (Plan V) respectively - the letter is therefore not the initial letter of the number of train carriages. Furthermore, the corner windows on the cabin at the head of the train were painted gray on Plan T and yellow on Plan V. Notable Materieel '64 innovations compared to older rolling stock included: double one-legged pantograph in the middle buttons on the inside and outside of the train for opening and closing the doors with central door lock (the conductor no longer has to walk along the train to close the doors) locked doors (passengers are no longer able to open the doors during the journey) electronic departure signal (the operator sees a light on his instrument panel and no longer has to wait until the conductor gives the departure signal) destination sign Older train sets and carriages were later provided with central door lock and broadcasting system. Not everything was renewed, for example, the characteristic heavy engine noise was maintained and the train sets all had a brake pad, a braking system in which a cast iron block is pushed onto the wheel tire when the train set starts to brake. This brake system leads to a roughening of the running surface, making the tire rolling noise high. More modern trains have a disc brake, which makes these trains quieter. The brake pad also causes a loud screeching sound at the end of the braking distance. Withdrawal In July 2010 the last Plan T EMUs were taken out of service. As of December 2012, only a small amount of routes were being served by Materieel '64 normally. They also had been used widely in 2010 and 2012 winters when many newer SLT's were out of service, due to winter problems. In 2015 there were still 40 Plan V sets in service, used on stopping services outside the Randstad. In late 2015, Nederlandse Spoorwegen announced the withdrawal of the remaining Plan V sets in the 2016 timetable, starting in December 2015. However, due to a shortage of rolling stock, several sets were kept in