Re: SLR - Extension construction

[billboltonREMOVE-TO-EMAIL@computer.org (Bill Bolton)]

neumannc <neumannc@ozemail.com.au> wrote:

> Whilst one substation would be adequate to run the existing line it
> would not provide any backup for failure of the substation so you have
> to have an alternative supply (= 2nd substation).

That depends on what you want to protect against.  Since the existing
line is so short, both the existing subs are on the same Energy
Australia main sector feed, so they can only protect against equipment
failure in the substation, which is a fairly low failure risk with
modern substation equipment.

> The airconditioning load on the variotrams is quite high as a proportion
> of the total electrical load of the tram (ditto for tangaras).  The
> "natural" air conditioning of the North Sydney trams did not require
> electricity!

The current drain of just one coupled set of O Class cars climbing
from water level to the top of the ridge, as they did all along the
Eastern end of the North Sydney system, would easily account for more
current than two Variotrams on the lightly graded SLR.

> North Sydney also had extensive feeders.

And much lighter gauge trolley wire than the SLR.

Cheers,

Bill