Railroad Forums
Moderator: Kurt-Trirail
frequentflyer wrote: ↑Wed Jul 24, 2019 11:45 am Impressed by the details. Designing the rails to be low impact visually, and low maintenance. Why more cities ( hey Austin,TX.) not look into this is beyond me.One of the largest issues with systems like these is the vendor lock-in. There is usually no way to contract for repairs or parts replacements with anyone but the original builder and the system may have to be torn down and replaced if they ever want to replace the trains. Compare AirTrain JFK to AirTrain EWR. EWR is going to be torn down at the end of its useful life, whereas it will always be possible to get a train running on 750V third rail, 4' 8.5" (even if they abandoned SelTrac and the aluminum propulsion strips).
west point wrote: ↑Wed Jul 15, 2020 12:18 pm I notice a few comments about monorail slow. How many others have ridden a monorail. There is a historic problem with monorails that has never been solved. Monorails above 30 - 35 MPH are dynamically unstable. That is they will shake them selves apart at those speeds. That is why Disney limits theirs to 25 MPH. Research has shown that active controls can dampen the unstable but what happens if it fails at high speed ? To get an idea of the cost the F-16 has active controls that almost double the cost of the aircraft.Ever hear of maglev? https://en.wikipedia.org/wiki/Shanghai_maglev_train
west point wrote: ↑Wed Jul 15, 2020 12:18 pm I notice a few comments about monorail slow. How many others have ridden a monorail. There is a historic problem with monorails that has never been solved. Monorails above 30 - 35 MPH are dynamically unstable. That is they will shake them selves apart at those speeds. That is why Disney limits theirs to 25 MPH. Research has shown that active controls can dampen the unstable but what happens if it fails at high speed ? To get an idea of the cost the F-16 has active controls that almost double the cost of the aircraft.Huh? Everything I can find says Disney runs up to 40mph.