From www.ptv.vic.gov.au:

Accessible trams

Low floor trams

Low floor trams make travel safer and more comfortable, improving accessibility for all customers. Low floor trams have two allocated spaces for customers using wheelchairs or mobility aids. This area is inside the double-door marked with a wheelchair symbol. Some low floor trams have buttons that alert the driver to activate the ‘bridging plate’ to bridge the gap between the tram and the platform. On other low floor trams, a specially marked call button overrides the automatic door closing mechanism to allow customers using wheelchairs or mobility aids extra time to enter or exit the tram. These trams also have an external door release (a blue button) to help customers using wheelchairs. There are more than 130 low floor trams on Melbourne’s tram network. We aim to run all services on routes 19, 96 and 109 with low floor trams. Routes 5, 6, 11, 16, 48, 58, 72 and 86 are partly serviced by low floor trams.

High floor trams

For customers with accessibility needs, priority seats are located near the doors closest to the driver’s cabin. The location of the priority seats makes it easier to speak to the driver and get on and off the tram. Remember - only speak to the driver when the tram is stopped. High floor trams have steps, so they are unsuitable for mobility aids including wheelchairs, scooters and motorised vehicles.

Accessible tram stops

There are more than 400 accessible stops across the tram network to complement low floor trams. Accessible stops have ramps that provide improved access for customers, including people in wheelchairs, parents with prams and elderly people. Accessible stops also feature improved lighting, granite and stainless steel finishes, raised platforms with ramp access, real-time tram arrival information and glass shelters. Many of the newest accessible stops feature pedestrian crossings with flashing amber lights and tactile paving to assist customers to safely cross the road. Selected stops in the CBD also have audio buttons which provide real-time arrival information.

Further Information

Public Transport Victoria Homepage)"