Suburban multiple unit
| Industry | Rail vehicle manufacturing |
|---|---|
| Founded | 1994 |
| Headquarters | Maryborough , Australia |
The Suburban multiple units (SMU) are electric multiple unit trains constructed by Walkers Limited and Downer Rail at Maryborough for Queensland Rail's Citytrain services between 1994 and 2011. This fleet is divided into three subclasses: the 200 series (units 201–212), 220 series (units 221–250), and 260 series (units 261–296).
Design
Each Suburban Multiple Unit (SMU) is composed of three cars: a Driver Motor car (designated number 5) equipped with motors across all variants; a middle car which can be either a motor car (numbered 6 in the SMU 200 series) or a trailer car fitted with a pantograph (numbered 7 in the SMU 220/260 series); and a third car that functions as either a Driver Trailer (in the SMU 200) or a second Driver Motor B with motors (in the SMU 220/260, numbered 8). Two three-car sets can be linked together to form a six-car train.
200 series
The SMU200 series was introduced in 1994 to alleviate rollingstock shortages caused by increased passenger demand, marking the first delivery of new trains since 1989. Twelve units were produced by Walkers Limited in Maryborough, with electrical components supplied by ABB. These units, numbered SMU201 through SMU212, commenced operation on 16 August 1994.
220 series
Debuting in August 1999, the SMU220 series supported service expansions on modernized routes such as the Caboolture railway line, replacing the remaining loco-hauled SX carriages within Brisbane's suburban network. Numbered from SMU221 to SMU250, these trains feature motor driving cabs at both ends paired with a trailer power car centrally positioned (DMA-T-DMB layout). Built by Walkers Limited in partnership with Adtranz, they incorporate IGBT-based traction systems that offer improved energy efficiency over the thyristor technology used in the SMU200s. While their body design closely resembles that of their predecessors, each carriage includes a single air conditioning unit located centrally. Some units were temporarily enhanced through software modifications to achieve higher speeds on the Gold Coast railway line, designated 'HS'; however, this upgrade was discontinued due to issues with wheel wear and braking performance.
Refurbishment
Older SMUs have undergone gradual modifications to enhance accessibility, including updated seating arrangements, improved lighting, and adjusted handrails tailored to assist elderly passengers, caregivers with prams, and individuals with disabilities. These refurbishments adhere to the requirements of the Disability Discrimination Act 1992, featuring robust linoleum flooring replacing carpets within the 220 series and blue seating zones separated by red tactile indicators near doors. Passenger information has been modernized with dot-matrix displays and automated voice announcements; these features were standard on SMU260 units from their introduction.
In response to challenges encountered with the NGR, government initiatives included comprehensive refurbishments of the SMU200 and 220 series at Maryborough aimed at extending their operational lifespan. Upgrades completed encompass new flooring materials, refreshed seat upholstery, as well as various cosmetic and mechanical enhancements. Refurbished SMU200 units can be identified by black-painted door frames on their cab doors, except for unit SMU205.
260 series
To meet growing demand, eight SMU260 units were commissioned from Downer EDI Rail in Maryborough in 2004. These units share design similarities with the Transperth B-series train, with the first two entering service in August 2008 followed by an additional fourteen units. A further order for twenty more units was placed in March 2009. The SMU260 closely resembles the IMU 160 series, differing mainly in toilet facilities and luggage racks; both classes are compatible for joint operation. With an operating speed comparable to , they are well-suited for interurban travel routes.
Refurbishment
Commencing in the 2023–2024 fiscal period, the SMU260 fleet is receiving a comprehensive overhaul. Units SMU262 and SMU266 have been fitted with updated vinyl flooring, improved wireless internet connectivity, new digital advertising displays, and revamped driver B carriages that predominantly feature sideways seating arrangements.