After the Moffat Tunnel opened, the tracks over Rollins Pass remained in place and were maintained at least as late as July 1929 as an emergency route. This emergency route was needed only once for a several day-long closure: on Thursday, July 25, 1929, dry rot of wooden timbers caused a collapse and 75 feet of rock caved-in and blocked the Moffat Tunnel near the East Portal. It took until Tuesday, July 30, 1929 for the tunnel to be cleared of debris. Permission to dismantle the rails on Rollins Pass was granted by the Interstate Commerce Commission on Saturday, May 18, 1935 and the rails were removed the following summer: the west side was cleared by Tuesday, August 11, 1936, and the east side 14 days later; contractors toiled non-stop, including overnight to remove both the rails and ties.: A wye on the passing siding at the East Portal of the Moffat Tunnel is currently utilized for short-turning some modern services and marks the spot where the Rollins Pass line, if it still existed, would have merged into the modern route.