Train 23 Beijing to Ulaanbaatar departs on Tuesdays until 27th May 2008
and is run by Chinese Railways. From 7th June 2008 train #23 switches departure
to Saturdays and is run by Mongolian railways. Chinese Railways will operate an
extra service departing Beijing on Tuesdays during the peak summer months and
returning from Ulaanbaatar on Friday (probably until 20 October 2009).