In 1968 I drove my 65 Cadillac sedan on the Moffat over Rollins Pass east to west. It was VERY exciting, however the Road did a number on the Caddy as the exhaust system finished the ride in the trunk - and boy it was easy to hear us after that LOL.
It's confusing but to get to the tunnel you start in Coal Creek canyon and when you get to Wondervu your on a pass between Coal Creek and South Boulder Creek canyon which can be called Eldorado, at least further down. South Boulder creek goes into Gross Reservoir and has water that is diverted from the western slope through a water tunnel that's alongside the train tunnel.
when I was a kid the late 60s early 70s you could still drive over the trestles , now the forest service has them closed, along with the pinheads of boulder county who keep needles eye tunnel closed . in theory its a county road, and the feds have no jurisdiction, but try telling Mr. ranger that.
Tolland and Rollins Pass were on the Denver Northwestern and Pacific Railroad, DNW&P (Moffat Road), later the Denver and Salt Lake Railroad (D&SL), NOT the Denver and Rio Grande Western (DRGW). The DRGW did not acquire the DNW&P/D&SL until 1947.
