Rock Creek Bridge Construction (Purple Line) October 8, 2022News, Prototypebsullivan Purple Line construction on the Rock Creek bridges. View is west, and in the distance you can see the new tunnels beneath Jones Mill Rd. Previously, the railroad crossed at grade. In 2019, after demolishing the trestle, they lowered the right of way and began construction of two new bridges across the Creek. From Facebook. This view from the 1990s and part of the Coalition For The Capital Crescent Trail collection, is a similar view from the years when the railroad was out of service.