The gist of all that german garble is that it is about twice the speed of sea freight, measured "door to door", while costing only half as much as air freight, but twice that of sea freight. co² emission is calculated as half of that of sea freight, and 25 times less than air freight. In 2016 they shipped somewhat over 40.000 containers in about 400 trains, which carry about 50 containers per train.
The NYT covered this in 2013 with an interactive feature: http://www.nytimes.com/newsgraphics/2013/07/21/silk-road/ http://www.nytimes.com/2013/07/21/business/global/hauling-ne...
hth
almost forgotten: https://en.wikipedia.org/wiki/Trans-Eurasia_Logistics https://en.wikipedia.org/wiki/Chongqing-Xinjiang-Europe_Rail...