The A-series trains are a class of electric multiple unit built by Walkers Limited in Maryborough, Queensland for Transperth between 1991 and 1999.

Studies for the electrification of Perth's suburban rail network began in 1984 and in 1988 43 two-car electric railcars were ordered from Walkers Limited, Maryborough.

While the trials were largely successful a number of negative points were noted, not the least of which were braking issues and the creation of a harmonic vibration from the train's bogies which caused nausea in otherwise healthy passengers.

Some sets have been named: The new trains revolutionised the commuter services on the Perth network, but their success was marred by project delays and a number of early accidents.

Some of those accidents involved collisions with motor vehicles at unprotected level crossings, the increased speed and quieter operation as opposed to the older, slower and louder, diesel trains being considered as a contributing factor.

Additionally, a number of teething troubles soon presented themselves, such as braking problems which meant that trains would sometimes fail to stop in the space required and thus not be correctly positioned at the station platforms.

Until late-2016, the Yanchep and Mandurah lines were also serviced by 12 two-car A-series trains at high-demand periods, coupled together to make 4 cars.

The USB port were designed and built by COMRAIL for the PTA to handle the harsh conditions and were tested to rail specifications.