Bombardier CR4000

CR4000 Flexity Swift
Tram 2544 running through snow
Interior of tram 2544
In service	2000 – present
Manufacturer	Bombardier Transportation and Vossloh-Kiepe
Built at	Bautzen, Germany Vienna, Austria Assembly and testing
Family name	Flexity Swift
Constructed	1998–2000
Refurbishment	2008–2009, Deep cleaned, new livery and new seats
Number built	24
Number in service	24
Formation	two section articulated tram car
Fleet numbers	2530–2553
Capacity	70 seats, 138 standing per tram
Operator(s)	London Tramlink (Tramlink) part of TfL
Depot(s)	Therapia Lane, Croydon
Line(s) served	4 routes
Specifications
Car body construction	Aluminium
Train length	30.10 m (98 ft 9 in)
Width	2.65 m (8 ft 8 in)
Height	3.67 m (12 ft 0 in)
Floor height	350 mm (13.8 in) – 400 mm (15.7 in)
Platform height	350 mm (13.8 in)
Entry	350 mm (13.8 in)
Doors	8 'plug doors' per set
Articulated sections	1
Maximum speed	50 mph (80 km/h)
Weight	36.3 tonnes (35.7 long tons; 40.0 short tons) per tram
Traction system	4x 120 kW (161 hp) Bombardier Three-phase AC traction motors
Acceleration	1.3 m/s2 (4.3 ft/s2) (2.9 mph per second; 4.7 km/h per second)
Electric system(s)	750 V DC Overhead
Current collection method	Pantograph
Track gauge	1,435 mm (4 ft 8 1⁄2 in) standard gauge

The Bombardier CR4000 is a 76% low floor model of Flexity Swift tram built by Bombardier Transportation in Bautzen and Vienna between 1998 and 2000 and operated by London Tramlink. They are based on and very similar in appearance to the built for use on the low-platform routes of the Cologne Stadtbahn network. The entire fleet is maintained at Therapia Lane depot, alongside the newer Variobahns. The trams are numbered beginning at 2530, continuing from the highest-numbered tram, number 2529 on London's former tram network, which closed in 1952.

The trams are six-axle single-articulated double-ended cars, with four doors on each side. The low floor section stretches between both the outer doors through the articulation (which rests on an unpowered bogie). Between the outer door and each car end is a higher-floor section, accessed up a step and situated over the car's two power bogies. The low-floor section is 40 cm (16 in) above rail-level, sloping down to 35 cm (14 in) in the doorways, a height that matches the platforms at tram stops, and each car has two wheelchair positions.

The trams are 30.1 m (99 ft) long and 2.65 m (8 ft 8 in) wide, with 70 seats and a total capacity of just over 200 passengers. They operate from an overhead power supply at 750 V DC, and have a maximum speed of 80 km/h (50 mph). They were originally fitted with destination blinds, which showed the route number, ultimate destination and intermediate points. These were replaced during 2006 with electronic destination indicators which show only the route number and final destination.

Each tram has an integral traction braking controller with deadman's handle. While stationary, the tram is immobilized until the driver's hand is on the controller: if the driver's hand is removed from the controller while moving, an alarm sounds immediately and the driver's hand must return to the controller to disarm it. If a three-second countdown passes and it is not disarmed, the track brakes are applied.