Line Relocation at Brush?

Looking at early BN Alliance Division timetables, there were not any speed restrictions for passenger trains going through Brush Jct. and Brush, CO. In the early '80's restrictions of 20-35 MPH began cropping up. Noting that the BN had a line from Sterling that connected with the line from Lincoln, I'm wondering if a line relocation took place that resulted in the speed restrictions.

Andy

Up until a consolidation in the early 1980s, Sterling was in the Colorado Division. We ran over the Union Pacific Julesburg Sub Sterling-Union where we took the Hillrose Sub on into Brush. There was a set of crossovers in Brush Hillrose Sub-McCook main that was ten mph at least L/1970s-M/1980s when I bid out of Sterling.