Suburban Multiple Unit (Queensland Rail)

Suburban Multiple Unit
A brand new SMU260 next to a refurbished SMU220.
Interior of a SMU260
Manufacturer	Walkers Limited Downer EDI Rail
Built at	Maryborough
Replaced	SX carriages
Constructed	1994-1995 (200) 1999-2001 (220) 2008-2011 (260)
Number built	36 carriages (200) 90 carriages (220) 105 carriages (260)
Formation	3 carriage sets
Fleet numbers	201-212 (200) 221-250 (220) 261-296 (260)
Capacity	240 (200) 236 (220-260)
Operator(s)	Queensland Rail
Specifications
Maximum speed	100 km/h (62 mph) (200-220) 130 km/h (81 mph) (260)
Weight	126.1 t (124.1 long tons; 139.0 short tons) (200) 122.1 t (120.2 long tons; 134.6 short tons) (220) 128.2 t (126.2 long tons; 141.3 short tons) (260)
Power supply	(?)
Electric system(s)	25 kV AC overhead lines
Current collection method	Pantograph
Braking system(s)	Blended Regenerative electric and electro-pneumatic
Track gauge	1,067 mm (3 ft 6 in)

The Suburban Multiple Units are a class of electric multiple units manufactured by Walkers Limited/Downer EDI Rail, Maryborough for Queensland Rail's Citytrain division between 1994 and 2011. The Suburban Multiple Unit is divided into in three subclasses, sets 201-212 as the 200 series, sets 221-250 as the 220 series, and sets 261-296, as the 260 series.

A Suburban Multiple Unit is a three-car set, with the lead car being a Driving Control Car fitted with motors for all variants (numbered 5), the middle car being either a motor car (numbered 6 for SMU 200 series) or trailer car (numbered 7 for SMU 220/260) with Pantograph fitted, and the third car being either a Driving Control Trailer Car (SMU 200 series) or the second Driving Control Car also fitted with motors for the SMU 220 and 260 series (numbered 8) Like most trains in the Citytrain fleet, two three-car SMUs can be attached together to form one six-car set. The 200 series and 220 series are interoperable, and can both operate together in revenue service as a six-car set.

The SMU200 series were introduced in 1994 due to a rollingstock shortage after an increase in Citytrain services as well as transitioning into a modern 21st century fleet. Twelve were built by Walkers Limited, Maryborough with electrical equipment supplied by ABB. The trains are numbered SMU201-SMU212. All have driving cabs at both ends and have buttons to open the doors as opposed to handles for the EMU sets.

The SMU220 series were introduced into service in August 1999 to cater for service increases on recently upgraded lines such as the Caboolture line triplication from Northgate to Lawnton. The SMU220s replaced the last remaining loco-hauled SX carriages suburban services in Brisbane. The trains are numbered SMU221-SMU250. All have driving cabs at both ends each having motors with a trailer power car in the middle. These cars were manufactured by Walkers Limited in partnership with ADtranz. These units use more energy efficient Insulated gate bipolar transistor traction packages, as opposed to the thyristors for the 200 series. Selected units previously had software upgrades to enable them to operate slightly higher speeds suitable for the Gold Coast line and would have the markings 'HS' on the right, but has ever since been discontinued once the faster SMU 260s entered service.