Class 755 bi-mode multiple units.
 

I was watching a YouTube video last night and was surprised to see the (fairly) new 755 bi-mode four car units have a motor unit sandwiched in the middle.

Looks a little strange at first glance.

https://hellertal.startbilder.de/bil...755-636585.jpg


https://en.wikipedia.org/wiki/British_Rail_Class_755