Thanks Mal (and Rick)!

David

> On 22 Nov 2022, at 2:09 pm, Mal Rowe mal.rowe@...> wrote:

>

> Greg Sutherland and others have often commented on the practice of 'easing the gauge' on curves.

>

> Richard Clark has h=kindly provided details in the attachment ...

>

> Thanks Richard!.

>

> ===

>

>

> Sydney Tramways had a standard for Gauges Grooves on Tramway Curves, attached, more than 120 years ago.

>

> In their wisdom grooved rail, then called girder rail, not to be used for under 100ft (30m) radius curves.

> The groove is increased from 7/8in (22mm) to 1 11/16in (43mm) for tight curves.

>

> The tramway operations included fixed truck coupled cars such as E cars and K cars.

>

> Rick C

> A registered professional engineer

>

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> <Gauges Grooves Super Elevation & Distance Between Tracks on Curves.jpg>