Vehicles in the Flexity Swift family vary in length, but are all articulated, usually with three sections. In most cases, the centre section is very short, but can be replaced with a longer section in order to increase capacity, as London is considering doing for future lines. The trams can also be coupled together into trains. Nevertheless, they are all bi-directional with cabs at both ends and doors on both sides. An emphasis is placed on speed with units capable of safely reaching speeds of when running on dedicated lines.
