At the very north end of the Greeley Sub (at Speer Jct), the eastbound California Zephyr crosses over BNSF's Front Range Subdivision as the Zephyr begins the final leg of its detour route between Salt Lake City and Denver.
Both UP and BNSF have lines between Denver and Cheyenne. Here at Speer Jct is where they happen to cross one another at a grade separation.
