A combination of cheap rail tickets and the long holiday weekend has prompted Germans to hop on trains, the national rail operator said on Saturday. At the beginning of the Whitsun, or Pentecost, holidays and after the introduction of the new €9 ($9.65) monthly ticket, regional trains are in great demand, especially to tourist destinations, according to Deutsche Bahn (DB). Travellers reported on Saturday that some trains were completely overcrowded and that there were also delays. Some rail customers were unable to find a seat, and in some places passengers with bicycles were unable to board r…