Passenger crowding on the $2.1 billion Sydney inner-city light rail is forecast to easily exceed "crush capacity" rates for buses and heavy rail, raising questions about patronage on key sections of the line.

The analysis is contained in a capacity report for the Sydney CBD and South East light rail, due to open in 2019, commissioned by Randwick City Council.

Discussing the Anzac Parade corridor, the report by EMM Consultants says passenger capacity is historically 2.5 people per square metre for Sydney trains and 2.8 people per square metre for buses.

But there is a maximum capacity of 466 people for each tram on the light rail, which the report says equates to 3.3 people per square metre.