Presenting my interpretation of the GTW 2/6 railcar in LEGO train set style with a nod to old LEGO monorail.
GTW (Gelenktriebwagen) which means articulated railcar is made by Stadler of Switzerland. The notable feature is a power module in the middle connecting the two passenger cars. The design reminds me very much of the LEGO monorail sets like the Airport Shuttle. I wonder if the designers at Stadler were inspired by LEGO monorail.
I chose the German DB colour scheme which looks similar to the LEGO airport shuttle colours.
Stadler GTW by dr_spock_888, on Flickr
My model has a Power Function train motor and AAA battery pack in the power module. The passenger cars are supported by the center power module. The 2/6 designation means six axles with 2 powered axles.
Battery pack on/off switch is reachable through a hole on the roof of the power car module using a toothpick or Technic axle. Alternatively the roof comes off like Horizon Express to access the switch.
Engineer compartment
The brick build dummy coupler can be replaced with LEGO magnet couplers for M.U. hookup or a Technic liftarm can also be used.
All aboard. Next stop, the airport.
EDIT: Add video