Really if you need a minimum number of triggering axel cars to trigger the crossing alarms gates -
I think the way the freight railroads get away this with a hundred of so cars in a freight consist who the hell is going to challenge a moving train at a crossing
A person waiting for a train at a crossing has no idea of the number of cars in the consist. At best, they can see the first couple of cars or so. Nonetheless, folks who challenge trains at crossings aren’t doing any calculations anyway. But that’s not what the axle count requirement in this thread is about.
Anyway this axel thing puzzles me - having only read about it a few posts/threads ago - - -
The faster a train travels - the more time is needed for the crossing gates to close in time to clear ordinary routine traffic from danger.
Logically the triggering points need to move further away for faster trains for this to happen - - -
and obviously a parked train at a crossing needs to disable that function until moving again.
You can't factor in ignorance of the traffic control devices - "Stupid is what stupid does - or tries to do"
The origin of the axle count restriction on CN dates back to the mid-2000s or so, when two separate incidents a short time apart (one in Illinois on the Illini/Saluki, and one in Michigan on the Blue Water) involved fatal grade crossing collisions where it was demonstrated upon investigation that the crossing gates failed to activate for those particular occurrences. It had nothing to do with the speed of the train or location of the activation circuits (the speed limit on a section of track and the crossing circuits are related to each other, so if the speed limit was 79 mph, the circuits in theory should be timed for a 79 mph train; adding axles does not change this calculation since it is really only the front of the train that is relevant for this particular purpose).
At the time, the typical consist was three to four cars and a locomotive, so 16-24 axles. Following these incidents, CN required (IIRC) 32 axles.
I don’t know what led to the axle count restriction on UP in Missouri, or any other specific locations that led to axle count restrictions.
I assume this maintenance is not part of the Level of Utility agreement Amtrak has with host railroads (which, in theory, mean that they can’t just downgrade large sections of track because Amtrak has to be able to maintain the agreed upon schedule; I guess the same does not apply to consist requirements).
But for now, between the pandemic (and resulting staffing shortages) and the delays in getting expected equipment delivered (Siemens cars), plus the quasi-unexpected need (wasn’t in the long-term plan, so they had to punt in order to fulfill it) to replace four Talgo sets in the northwest with conventional cars, Amtrak is forced to find whatever they can that is rail-worthy to run at passenger speeds and run it on these routes. If they put a lounge on the Eagle, what car would they take off of the Eagle to legally run trains in Illinois? Or, what other route should lose a car? I would definitely believe there really aren’t any operable spares right now, and anything they can get running is going towards bringing back service on routes that had frequencies cut.
It’s definitely conceivable they could have done things differently in 2020 and 2021, but given that time machines don’t exist, and the question is what can be done right now, there really aren’t any good options.