The tunnel is actually two, roughly bored into the tough Berkshire rock without any sort of lining or facing. Around 1990 Conrail single tracked the line and abandoned one of the tubes. Today this tunnel hosts some fantastic ice formations in the winter time instead of freight trains. I had traveled to the tunnel once before via the Lake Shore Limited after a snowstorm.
Also in this set are some pics of some hydro electric plants in the Albany area. It's quite amazing how much clean energy is produced in the Hudson River watershed from small hydro plants of between 5 and 30MW capacity.
You can see all of the pics here.
First I stopped by a popular railfan location at the southern end of the old D&H Mohawk Yard and caught a pair of NS engines, including C40-9W #8939, idling. There's going to be a lot more NS traffic through here as this is part of their new Patriot Corridor.
And the old Delaware and Hudson Colonie Sub bridge on the line to Albany.