Melvin P posted:With the minimal speed on yard tracks, even on a main going thru a curved yard, reduced speed in order. No need for super-elevation at all.
Not necessarily. Tack for example, the former C&NW Proviso Yard (now UP), is curved, yet has a double track main line to the north side of the yard, and there is no speed restriction on the curved main line, which is super-elevated, for the METRA commuter service. Thus, the main line is NOT within "Yard Limits".