Found this side spur off of Cumberland Pass, It looked promising like it could take us over the range to Buena Vista. The only name we saw for it was Alpine Tunnel. Turns out is was and old RR grade most of the way and not too hard. Very Scenic particularly near the top.
Second on of these we have come across on this trip. Old water filling station for steam locomotives.
This is right after the hardest pitch on the whole climb. It's around the corner behind us. The trail forked right looked really hard. The sign indicated the Alpine Tunnel was to the left. That works, onward.
Took these a little farther up the pass. Within a half mile of the summit and the tunnel. I remember looking up at the top of the ridge and thinking, "thank God there is a tunnel." There is no way we are going to make it over this thing.