That's a 6 mile back-up from the wye to the new station - over a mile more than the old one.
What is the back-up allowed speed? Conductor on the (leading) rear end with a radio to the engineer on the trailing end?
Related to new stations in the area, I saw on the Amtrak forum that it was officially decided that the new station in Buffalo will be downtown and NOT at Buffalo Central Terminal.
See the APril 21 post by Jeff Smith (and the Buffalo News link) at viewtopic.php?f=46&t=158020&start=285
" onclick="window.open(this.href);return false; . TO me it is unclear if the Lake Shore Limited would use a new downtown station or skip it like the Exchange St station - a backup move of a mile is required.