SBB CFF FFS RABe 502 Twindexx "swiss Express" 2nd Class Trailers Shell Set (4x Trailers).
The windows can be made using Kristal Klear (here's a youtube tutorial) from a hobby store.
Please note: some modification may be required to body shells, chassis or glazing to make this model work. Model is in kit form and assemby and painting is required.
For the front cabs...
N06 - SBB FFS FFS RABDE502 Twindexx Cab Set