Thanks, Matt and Mal. Most interesting. I wonder if the crew had stopped off for a pizza? Apologies for delay in replying - have
been in Sydney at Liberal Party State Council and Convention - just got back to find 300 new emails!

Regards

Dudley Horscroft
----- Original Message -----
From: "Mal Rowemal.rowe@... [TramsDownUnder]" TramsDownUnder@...>
To: TramsDownUnder@...>
Sent: Thursday, July 20, 2017 3:42 PM
Subject: Re: [TramsDownUnder] Scrubbers [1 Attachment]

> On 20/07/2017 12:05 PM, 'Dudley Horscroft'transitconsult@...

> [TramsDownUnder] wrote:

>>

>> Surely, rather than using short scrubber/grindstones (are they the

>> same or different?) it would be desirable to use stones about one

>> metre long so as to ensure that only the tops of the corrugations are

>> removed.

>>

> Hi Dudley,

>

> The terminology varies from country to country.

>

> It is my understanding that what we call a scrubber is called a grinder

> in the USA and possibly Europe.

>

> Here's a pic of the Ballarat scrubber at Bylands - with an inset showing

> the carborundum block that is used to scrub the rails.

> http://tdu.to/Ballarat-scrubber-block_Bylands_5Oct2014.JPG

> You wll see that the block is sitting on the bumper in the main picture,

> and is about the size of a house brick.

> All it does is clean / smooth the top of the rail.

>

> In Australia, a grinder was more complex - re-profiling the rail head

> and cutting the groove a bit deeper using grinding wheels.

> There's an official pic of one of the big MMTB grinders at:

> http://tdu.to/a24583/MMTB_report_RailGrinder.jpg

>

> The big Melbourne grinders were based on the Woods-Gilbert design - an

> early Melbourne designed 'rail planer' that even had a stint of service

> in the UK.

> See: http://tdu.to/130891.msg

>

> See also my earlier posting - with other pictures -at:

> http://tdu.to/193985.msg

>

> Mal Rowe

>