A total of 93 RABe 511 [de] trainsets (69 six-car/24 four-car units) were delivered to Swiss Federal Railways, numbered 511 001–511 093, some for use on the long-distance IR or RE lines (red-white-grey livery)[8] and others on the Zurich S-Bahn network (red-white-blue livery) in the Zurich metropolitan area.

Compared to previous generations, they are characterized mainly by a higher number of standing passengers per car, in part because the longer trains have proportionately fewer seats.

The trains are 15 cm (5.9 in) wider due to placing the HVAC channels under the ceiling instead of behind side panels.

The headroom is still two meters, because friction stir welded floor panels made from aluminium extrusions are used.

Like in the KISS's predecessors, low-floor entrances, vehicle air conditioning and vacuum toilets (two, including one wheelchair accessible) are available.