The Hell-Gate is single-track now using only Track 2 between Gate & Manor because they have to re-do the new wire that was installed on Track 1. Supposedly Track 1 will be out of service for at least 6 to 7 more months.
As for where this train was heading west that isn't directly due to the single tracking but because like "Red Sox Rock" said they can go over LIRR moves as opposed to getting stuck at Harold. Also, by doing this you can do track speed off the Hell-Gate whereas if you were lined to cross back to 1 @ Gate you'd have an Approach Limited at the Distant Signal to Gate and have to do 45mph from there all the way down.
Neroden, unfortunately nowadays there are too many people getting in trouble for posting employee info such as track charts, otherwise I would have.