Tram and light rail gradients in Sydney.

Doubtless discussed previously, but what were the steepest adhesion-only
grades on the former Sydney tramway network and what are the steepest
encountered by the current Sydney light rail lines? My old Tramway
Gradient Diagrams book on p.22 gives the grades to and from the Central
Colonnade as 1:15.61 and 1:18.48 which would still be in use by the L1
Dulwich Hill route, but in the opposing direction to the older Pitt &
Castlereagh Streets trams.