what are USA federal, state, county, & city, freight train crossing derailment speed & length limits

air brake technology limits US freight trains to 12,000 feet or 2.27 miles on Class I rail roads
& legislation defines 7,500 feet as a "long train" but will not restrict them to this length
as that would increase fuel consumption by 13% Based on 2019 data that also showed that:
.1% of trains were 14,000 feet. 2.65 miles
.9% were longer than 10,000 feet.
10% were longer than 9,800 feet
50% were longer than 5,400 feet &
50% were shorter than 5,400 feet
or a median length of a mile

freight trains are designed to travel at 70 and 75 mph , a normally loaded freight train will move at 40 and 50 mph , an averaged freight train speed ranges from 20 - 30 mph , en example Union Pacific train averaged speed in 2021 was 25 MPH & Slow zones, hills, heavier payloads &or longer trains drop all of this to 5 or 10 mph

Passenger trains are limited to 60 mph & freight trains are limited to 50 mph on USA tracks without block signal systems

Federal regulations do specify inspection frequency at most highway grade crossings & tracks but 49 CFR 213.247(b) limits them to 110 mph

of the 130K public at-grade crossings; , 50% have automatic warning systems, 34.7% have flashing lights & gates , & 15.5% have flashing lights only & of 80K private at highway-grade crossings MOST have no warnings

Australian Billiton BHP Iron Ore's freight train is 24000 feet or 4.6 miles , Brazils mineral transport category trains can be 10,500 feet or 2 miles & most European trains are 2430 feet or .46 miles because sidings on some networks have a max length of 1476 feet or .28 miles

https://archive.ph/tmyPc
https://archive.ph/HIGxK
https://archive.ph/QahIY
https://archive.ph/vAmEd
https://archive.ph/xcIkw
https://archive.ph/zRI1w
https://en.wikipedia.org/wiki/Slow_zone
https://www.gao.gov/assets/gao-19-443.pdf
https://railroads.dot.gov/sites/fra.dot.gov/files/2019-11/Grade%20Crossing%20Resource%20Guide%20022015.pdf
https://archive.ph/5i7xl

https://en.wikipedia.org/wiki/Longest_trains

https://en.wikipedia.org/wiki/Rail_speed_limits_in_the_United_States
https://www.ecfr.gov/current/title-49/subtitle-B/chapter-II/part-234?toc=1

Julian Ritter's razor-train
https://youtu.be/kf5L-BUEALU
https://youtu.be/4QmidU1ZBuA
https://youtu.be/ZnvqeeusmG0
https://www.deviantart.com/mrtheeb/art/Half-Life-Razor-Train-868335941

= all other citations archived due to youtube link bot & censor flag threats

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