by N340SG
A while back in this forum I quoted a passage from a book from the manufacturer that the M-7 top speed is limited by the propulsion system computers to 100 mph. Yes, that 100 mph max would be assuming that the ATC was cut out. Otherwise, 80 mph is tops, as you guys know.
The ability to do over 80 mph in certain places between Metropolitan Avenue and Harold some years ago was due to an anomoly, that being a higher MAS current than should have been in the rails that enabled the Engineer to effectively attain an electric cutout of the ATC. That situation has been rectified. You're not crazy. Trains did occasionally go above 80 at that time, in that area. I was in a few of them.
The MAS speed limit could conceivably be enforced by the modern computerized propulsion system (sort of like cruise control in your car), but is not on LIRR equipment.
On all our equipment, the current speed limit is enforced by cutting off propulsion power and putting on the brakes when in an overspeed condition.
Brakes can be released and tractive effort reapplied as soon as the overspeed condition is cleared.
Tom
The ability to do over 80 mph in certain places between Metropolitan Avenue and Harold some years ago was due to an anomoly, that being a higher MAS current than should have been in the rails that enabled the Engineer to effectively attain an electric cutout of the ATC. That situation has been rectified. You're not crazy. Trains did occasionally go above 80 at that time, in that area. I was in a few of them.
The MAS speed limit could conceivably be enforced by the modern computerized propulsion system (sort of like cruise control in your car), but is not on LIRR equipment.
On all our equipment, the current speed limit is enforced by cutting off propulsion power and putting on the brakes when in an overspeed condition.
Brakes can be released and tractive effort reapplied as soon as the overspeed condition is cleared.
Tom