On 28/01/2021 12:46, Matthew Geier wrote:
> I think the thing here is actually timber form-work. They appear to be going for some sort of inset paving around the tracks with two concrete 'strips' either side of the rails. Concept drawings show a variety of street paving types.
>
> High density foam is 'wrapped' around the rails to provide both vibration absorption and electrical isolation.
>
Tim Boxsell's picture illustrates that structure very well - I have expanded it a bit to show the components you describe.
Mal Rowe - not expecting to see this track relaid in his lifetime.