Sydneysiders are set to get a chance to ride on the city's new $2.7 billion-plus light rail line as early as December 7, which is the target date for trams to start carrying passengers.

And like with the opening of a $7.3 billion metro rail line in Sydney's north west in May, the state government is expected to make the first day of services along the light rail line between Circular Quay and Randwick free.

The government has been reluctant to put a definitive date on the opening of the line through the heart of Sydney because final testing of the 67-metre long tram sets along it is still under way.

A simulation of the light rail timetable is already under way. Credit:Louise Kennerley

If authorities decide more testing is required, the start of services will be shifted to the following weekend of December 14-15.