Hello, I'm wondering how you'd go about curving a double track so that the distance between them remains the same at all times. I can't find any information about this online, and AnyRail is proving almost impossible to use because whenever I need to curve my double tracks, I'm not sure which length/radii to use in order to not have them either meet or drift apart. If anyone has any tips, that'd be great, thanks.
As a side-note, if anyone can recommend the best manufacturer of trackage (UK), I'd be very grateful. I'm new to this and could do with some advice.