What a difference between the open steppes of Mongolia to China. We spent a very long time as they changed the bogies at Erlain around midnight. The guidebooks indicated that we would be able to get off the train, but that was not to be. For five hours the bathrooms on the trains were closed and many ended up using some empty plastic bottles to relieve themselves.
The bogie---train wheels--change was needed because both the Russian and Mongolian trains have wider rails than other countries. Basically they take the train carriages into the bogie shed and decouple each carriage and then hydraulically lift the carrriage, disconnecting the boggies, rolling them away and rolling in the narrower boggies.
Finally we each go our own way after posing in front of the Beijing Rail Station with Rosie as our photographer.
Here is the walking street by the Leo Hostel--more for the Chinese than the foreign tourists.