An intercommunicating passageway (9) between double-decker articulated railway coaches (1) including a wheel frame (10) with a lowered center section (11) and a pair of wheels (12a, 12b) are at an area between two successive coaches, which have a lower passenger room (7) with a first floor (3) at a first lower level (H1a) between pairs of wheels, and an upper passenger room (8) with a second floor (4) at a higher level (H2), on top of said lower passenger room. In the passageway a first bridge (5) extends between two successive coaches, the first bridge being at a second lower level (H1b) on the first floors, and a second bridge (6) extends between the two successive coaches, the second bridge being substantially in the same higher level with the second floors of the coaches connected. The first and second lower levels (H1a, H1b) of the first floors and the first bridge are down from the highest peripheral point (P) of the wheels.