Whats the point of the double deck passenger waggon?

[Gazer75]

This clearly belong with the EMU, but you can't add them between the front and end.
So whats the point of it? It looks just weird sticking them to the back of the EMU or behind a regular loco.

[Nicky]

You can create your custom high capacity train with a different engine. They are used in my country all the time not beeing part of a multiple unit.

[Rezania]

Same thing here. In my country we only have EMU's with double deck wagons. Especially the Bombardier ones look very wierd to me behind a normal locomotive.

[Griggers]

What's so wierd with a loco pulling the double decker cars? In my country (Belgium) we only have double decker trains combined with locos (mostly in push-pull combinations). I did some modifications myself to allow me to use the RE 450 engine and control car by them self and in both directions. This allows me to get creative with these trains. My favourite is 1 traxx + 10 cars + control car facing back.

[rcp27g]

Simple reason: https://de.m.wikipedia.org/wiki/S-Bahn_Zürich#/media/Datei%3ASBB_Re_420_Andelfingen_HVZ-D.jpg

Those are real world Re450 cars. The fixed sets had one trailer car each replaced to make it wheelchair accessible and the spare cars were used with Re420 locomotives as pictured.