PaulM
Engineer
Actually it's a dirt road. A few years ago my son and I biked it from East Portal.to Rollins Pass and back; and I can tell you the ride up was a lots easier than down.One of the most interesting aspects of most railroad tunnels (to me at least) is the route prior to the construction of the tunnel. Like the Cascade tunnel, I find the original route quite interesting and this pieced-together old topographic map does a good job of showing it:
Original Route & Moffat Tunnelc.jpg
Some of this route is still visible on Google Earth.