Hi, i noticed that BR 378 has somehow weird constraints. I could build only trains in formation like this:
Front - middle - (more middle) - powered middle - rear (- front again...)
I'm not sure about the technical abilities of these cars, according to wikipedia they are 4 car units (F-M-PM-R). Some first units were only three cars (maybe F-M-R), and they plan to extend them to 5 or even 6 cars but I couldn't find info if the extra cars would be powered or not.
In game acceleration is quite bad so I would like to build a convoy where every other car would be powered. I have prepared a dat file that allows units whit arbitrary mix of powered and unpowered cars in the middle. If someone knows better what constraints are on real units I can change it.