The latest passenger electrics to be seen at Beijing are class HXD3C, based on the HXD3B freight locos jointly developed by Dalian Loco and Bombardier. They appear limited to 120km/h which is probably sensible as much of the coaching stock is also limited to that speed.
HXD3C 0643 departed with a very long train K43, the 10:55 to Lanzhou via Baotou, formed of 120km/h stock.