How to couple multiple SGNSS-Y and RBNS train cars to the Henschel?

[VELOCIRAPTOR]

I've been learning how to drive the different trains and how to couple train cars, and I can't figure out how to couple more than one car to the back of the Henschel. I've tried selecting cars then pressing F7, selecting the Henschel and pressing Control-F7, and moving them around in different orders and nothing worked. There's no command list for either train car either, and researching the problem has turned up nothing.

 

[Xploder98]

Hello there.

I apologize for such a late reply, but I found a most helpful guide on how to couple the SGNSS-Y and RBNS train cars from the author himself some years ago. Hopefully you might find it useful.