The carriage will allow for at least four people in wheelchairs, along with their family and carers, to travel around the park in the fully enclosed train carriage.
The Western Australian Light Railway Preservation Association, a not-for-profit volunteer organisation which operates the Bennett Brook Railway train service, built the new carriage with support from Whiteman Park's railway improvement fund.
The carriage door has a drawbridge-style ramp that connects to the platform, while the carriage's door mechanism is linked to the brakes, so it will only open when the brakes are fully engaged.
When in service, the wheelchair carriage will operate on Wednesdays and Thursdays.
The works were undertaken by retirees who are active members and volunteers of Bennett Brook Railway.
Image caption: Nulsen Group carer Sai and his client Sam, and the Western Australian Light Railway Preservation Association’s Geoff Smith, who designed the carriage and built it alongside fellow volunteer members.
