I had the fun of riding the D&H aboard The Adirondack just a month ago, and before the trip, I had the same question in mind. Recalling that Canadian Pacific hit the brakes on upgrading the line because traffic volume didn't justify the investment, I was extra vigilant for freight traffic.
Passing a yard near Saratoga, one string of covered hoppers was in a line, a D&H painted diesel on the point. OK, that was one.
In the hours to come, The Adirondack passed a total of three southbound freights, far less than I had anticipated. Yes, we're in an economic crisis, but wouldn't you think that backordered items would still be enroute? You have to wonder what traffic was like at the same time two years ago.
You ask "What if the D&H double-tracked?", I ask what if the alignment were changed? I'm not familiar with the line down to Binghamton, however I've ridden north enough, and the welded rail was a welcome improvement. We hit a stretch of section rail north of Saratoga that nearly took my teeth out and when I say we hit it, WE REALLY HIT IT. I counted at least three stretches of section rail, and I noticed the train was able to travel consistently faster, than the last time I had made the trip some twelve years previous. The section rail sucks the life out of the schedule, making the train fall from 23 to 35 minutes late.
Looking at that line today in many ways is like the old adage from oil companys changing brand names; "New name, same old Gas". CP is encountering the same problems the D&H ran into; 1) Lack of traffic to justify upgrades. 2) Low speeds effecting delivery times, but I have to say, I saw a big improvement over the way it was in the 60's through the 90's.
Double tracking would improve speeds only in eliminating the waiting time on passing tracks. To make this route more appealing to shippers and travellers requires far more than double-tracking and welded rail. France and Germany dug entirely new ROW's for TGV and ICE trains, virtually drawn with a ruler in arrow straight precision. It struck me while going through the woods and farmland on that trip that such a realignment to eliminate curves, is only hampered by a lack of boardroom vision and capital to execute such a project. The land is there, the land is virtually empty, cut a new ROW for high-speed passenger and higher speed freight transport. If there had not been a political upheaval in Quebec effecting domestic Canadian and foreign investment there, it may have been done twenty five years ago.
We can't think in terms of going retro, like adding more tracks, when the infrastructure needs a full replacement. That line was made when locomotives were tea kettles, and trains weren't two and three miles long. Make a new ROW for modern, faster equipment, and undoubtedly, it would be double-tracked to start. Then there's the issue of generating revenue. If you build it, will they come?
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