I also think the 2" rule is somewhat wide. I am using the 2-1/16" in my yard, but on the mainline I'm looking at the prototypical distance, whatever that is. I'll be checking on that at northshoreline.com message board. The line was engineered to steam road standards of the time, so it's probably on the order of 12-13 feet.
Jay The Canada Goose is living proof that birds have cross-bred with cattle and rats.
Sewell's Point. Lambert's Point was the N&W terminal.
David Thompson, and the AEs only ran to Norfolk on a few test trains in the early 1920s...
"Shiva, you have always been my best general. Can you stop them?" "No. But I will try."
Exosquad- 'Fall of the NeoSapien Empire, Part 5: Abandon Hope'
It depends on your prototype and minimum radius. 2 1/2" is needed for large US locomotives on sharp curves. My web page has a graph for HO track centres, NSW prototype. This would be OK for most European prototypes. I used the a NSWR formula, included the extra for super elevation and a small amount for model clearance between track and wheels.
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