[/quote=""]Fair observation, the turnout in the report (up end) was 1:10 and on the curve (vehicles all settled to the curve). Would need to know what is installed the other end to be a fair comparison. 1:8.75 would be a typical size for this application, could be enough to make the difference. It will come out no doubt in the future report.[/quote]
When the loop was 900m long, the turnouts installed in 1960 would have been the same, and low speed, with the arrival home showing R/R/Y.
When the loop was extended to 1500m, the Sydney end turnout was moved to a new position, and the V-crossing was probably improved from 1:8.75 to 1:10. The searchlight signals at that end (in new positions) were also changed to RYG in separate lamp cases.
Why this turnout wasn't improved to, say, 1:15 at a higher speed is unfathomable, except for cost.
If that had be done, the loop entrance speed would have remained at 15km/h, while the loop departure speed would have been improved.
Passing Lanes have 80km/h turnouts at both ends, and the arrival signal is R/Y(80) or R/G(80). The V-crossing angle is unknown. Can someone measure these angles, so that we all know?
BTW, NSW loops are a bit different. Naturally.
When the loop in unoccupied, the Arrival signal shows R/R/G.
If the loop in occupied, then provided that there is a Y shunt light, the Arrival signal shows R/R/Y.
(On the North Coast- can't speak for other lines) the Low Speed Green has a 200m long berth track, though if the top red is lamp proved, the berth track is bypassed.