Thanks Mal for this.  Problem solved!  Dudley

On 5/01/2021 9:04 am, Mal Rowe wrote:
>

> On 04/01/2021 20:58, Anthony Dudley Horscroft wrote:

>> In the Hague I was on one of the PCCs and noted a switch on the

>> instrument board labelled, I think "Trekweg".  I believe that it was

>> used to operate something - perhaps a relay under the tram - that

>> would set the points in a particular direction.  Possibly an early

>> version of Vetag. Those in Sydney can perhaps confirm a similar

>> switch on their PCC, and those in Melbourne may comment on its

>> presence or absence on 980.

>

>

> Pic attached.

>

> As far as I know all the button did was draw enough power to ensure

> the 'power on' condition was met for the standard Collins Point Turner

> system.

>

> With the automatic acceleration on the PCC it could not be guaranteed

> that the tram would be drawing current at the right moment.

>

> By the way, the picture also shows the mechanical linkage between the

> brake handle and the back of the controller where it connected to what

> was originally the brake pedal link in the PCC controller installed in

> an MMTB box.

>

> Mal Rowe - who once drove 980, but didn't need to change any points.

>