The 7-car version has a max speed of 70hm/h in-game, not 80km/h

@oxmotatze The MVG trams also use normal Gauge (1435mm) and they also use the coupler-less version, for coupled trains, they use the Siemens Avenio instead.

"Variobahn trainsets are not design with couplers, therefore they cannot be joined to create longer trains"

The narrow Gauge-Variant made for OEG / MVG today RNV (Rhein-Neckar-Variobahn) has couplers and is often driven in 2-Car-Traction.

But your Variobahn is an other variant, so the non-couplers-configuration are ok as well