Hope the link works ..
https://m.facebook.com/groups/401975723154960?view=permalink&id=2359320220753824
Interesting video. Any ideas as to what models were used?
That kind of thing has been done before. They're HO locos, it's the sort of thing Marklin or Fleischmann would get up to. Marklin have certainly had a bunch of BR143 locos haul a full size coach back in 2007. I thought the track looked a bit like Marklin stud-contact but that might just be the quality of the video.
[edit] found this on JNS forum, which includes a full 13 minute better quality video about the event and the preparations (german language)
http://www.jnsforum.com/community/topic/14172-full-size-german-loco-pulled-by-198-ho-models/ (http://www.jnsforum.com/community/topic/14172-full-size-german-loco-pulled-by-198-ho-models/)
I paticipated in one of these in France over20 years ago. We supplied the tank wagon and Minitrix provided the traction.
Is there a link for us ludites who don't do facebook?
Fun stuff!