Due to work being undertaken to improve McIver Train Station, the Armadale line platforms will be closed from 7 October 2003 until 10 November 2003.
A 50-year-old Hills Fig tree, previously earmarked for removal as part of a $5.5million upgrade to Bassendean Train Station, is to stay.
Western Power Integrated Network Services (WPINS) has won a $3.3million contract for the construction of an electricity feeder station at Beckenham.
A new, state-of-the-art bus station at Mandurah has reinforced the southern coastal city's role as the major public transport node within the Peel region.
Planning and Infrastructure Minister Alannah MacTiernan said the trials would run for five weeks.