The NEC is an extremely busy piece of railroad. The only time Amtrak has available to do track, catenary, or signal maintenance is off hours: between one and five am. I have had occasions to have to get Amtrak to kill the NEC catenary and signal system, and my only chance is early AM, and even that is a tough sell. Internally, it is no easier for Amtrak to plan its own work.
The incremental revenue from late-night freight moves would be more than offset by the cost and inconvenience of having to work around additional off-hours trains. Bottom line: it is more important to have work windows to keep the corridor maintained than it is to run some ancillary freight trains for what would be nickle and dime revenue.
Well, the UPS moves are not really nickle and dime stuff but fairly high-revenue, time-sensitive shipments, (of which both CSX and UP have screwed up in the past). Amtrak has the fastest tracks in the country connecting major markets. However if the window is too tight to squeeze a few fast-freights through then that makes sense.
I'm with PRR here. While the NEC does have high track speeds for passegner trains, if you crack the book for freight trains you'll find a much different story.
Between MP 86 & MP 94 Speeds on the Main Line between Mill River and Boston
Acela-125 MPH
Regional-100 MPH
Freight-40 MPH
I think those numbers pretty much speak for themselves. Maximum Speed permitted for freight on the NEC is 50 MPH. I expect these numbers for several reasons. First, Amtrak doesn't want freight trains tearing up the rails. Passenger trains are fast and light while freight trains are slow and heavy. Even if you have plenty of power to move the train you also have to think about the wear of the track. Secondly is the equipment itself. Even the best TTX cars are authorized to travel at a maximum of 70 MPH (as are most freight engines). You have to remember that the way a passenger engine is geared is far different than that of a freight engine, they're not readily interchangeable. There are also height restrictions to take into consideration, I know you can get TOFC through Baltimore, but I don't think you can get it through the Hudson/East River tunnels. I could be wrong though. Double stack is definitely out of the question. Even assuming you can get TOFC through the A Tower area in New York, you also have to remember that you have to run through there under electric power, not diesel. The only engines Amtrak had in recent history that could consistently handle freight are the E-60's, most of which have been scrapped. The AEM's may be able to handle freight, but the HHP's definitely cannot, and neither engine is set up to read EOT signals. As for the Metro North issue, Amtrak does not carry any Metro North trains on its tracks. Metro North hosts Amtrak, but not vice versa. Amtrak does host other MTA trains (LIRR), but they in all reality are two separate authorities.
Plain and simple the freight roads are better equipped to handle the high priority freight. They have the facilities, skills, people, and equipment to handle these trains. Their tracks are built and maintained to allow high priority trains to be able to move at speeds up to 70 MPH. You may even recall Amtrak and NS did an experiment moving TOFC between Philadelphia and DC interchanging to NS from there. As you might imagine after a few test runs the project fell flat on its face, and it never became a regular train. At this point in time Amtrak needs to stay with the basics. Get good at moving people before you start diving into other projects.