Yes, it is happening. Freight from China is shipped by rail to several European countries and now reaches all the way to the UK. Here is a link to a BBC article covering the first arrival in the UK in 2017:
https://www.bbc.com/news/uk-38666854
Note the ceremonial use of a Class 92 on a non-electrified track for the event; a GM Class 66 diesel was pushing on the hind end. 92s are used to power freight trains through the Channel Tunnel.
Bob