Related Research Articles
In rail transport, a train is a series of connected vehicles that run along a railway track and transport people or freight. Trains are typically pulled or pushed by locomotives, though some are self-propelled, such as multiple units. Passengers and cargo are carried in railroad cars, also known as wagons. Trains are designed to a certain gauge, or distance between rails. Most trains operate on steel tracks with steel wheels, the low friction of which makes them more efficient than other forms of transport.
A railroad switch (AE), turnout, or [set of] points (BE) is a mechanical installation enabling railway trains to be guided from one track to another, such as at a railway junction or where a spur or siding branches off.
A track warrant is a set of instructions issued to a train crew authorizing specific train movements. The system is widely used in North America. The warrant is issued by the train dispatcher and delivered to the train crew via radio. The train crew copies the instructions onto a pre-printed paper form and reads back the warrant to ensure that nothing was misunderstood.
Centralized traffic control (CTC) is a form of railway signalling that originated in North America. CTC consolidates train routing decisions that were previously carried out by local signal operators or the train crews themselves. The system consists of a centralized train dispatcher's office that controls railroad interlockings and traffic flows in portions of the rail system designated as CTC territory. One hallmark of CTC is a control panel with a graphical depiction of the railroad. On this panel, the dispatcher can keep track of trains' locations across the territory that the dispatcher controls. Larger railroads may have multiple dispatcher's offices and even multiple dispatchers for each operating division. These offices are usually located near the busiest yards or stations, and their operational qualities can be compared to air traffic towers.
The Montreal, Maine and Atlantic Railway was a Class II freight railroad that operated in the U.S. states of Maine and Vermont and the Canadian province of Quebec between 2002 and 2014. It was headquartered in Hermon, Maine.
A track circuit is an electrical device used to prove the absence of a train on rail tracks to signallers and control relevant signals. An alternative to track circuits are axle counters.
Catch points and trap points are types of turnout which act as railway safety devices. Both work by guiding railway carriages and trucks from a dangerous route onto a separate, safer track. Catch points are used to derail vehicles which are out of control on steep slopes. Trap points are used to protect main railway lines from unauthorised vehicles moving onto them from sidings or branch lines. Either of these track arrangements may lead the vehicles into a sand drag or safety siding, track arrangements which are used to safely stop them after they have left the main tracks.
Standards for North American railroad signaling in the United States are issued by the Association of American Railroads (AAR), which is a trade association of the railroads of Canada, the US, and Mexico. Their system is loosely based on practices developed in the United Kingdom during the early years of railway development. However, North American practice diverged from that of the United Kingdom due to different operating conditions and economic factors between the two regions. In Canada, the Canadian Rail Operating Rules (CROR) are approved by the Minister of Transport under the authority of the Railway Safety Act. Each railway company or transit authority in Canada issues its own CROR rulebook with special instructions peculiar to each individual property. Among the distinctions are:
Positive train control (PTC) is a family of automatic train protection systems deployed in the United States. Most of the United States' national rail network mileage has a form of PTC. These systems are generally designed to check that trains are moving safely and to stop them when they are not.
The General Code of Operating Rules (GCOR) is a set of operating rules for railroads in the United States. The GCOR is used by Class I railroads west of Chicago, most of the Class II railroads, and many Short-line railroads.
Automatic block signaling (ABS), spelled automatic block signalling or called track circuit block (TCB) in the UK, is a railroad communications system that consists of a series of signals that divide a railway line into a series of sections, called blocks. The system controls the movement of trains between the blocks using automatic signals. ABS operation is designed to allow trains operating in the same direction to follow each other in a safe manner without risk of rear-end collision.
The 2008 Chatsworth train collision occurred at 4:22:23 p.m. PDT on September 12, 2008, when a Union Pacific freight train and a Metrolink commuter train collided head-on in the Chatsworth neighborhood of Los Angeles, California, United States.
Rail speed limits in the United States are regulated by the Federal Railroad Administration. Railroads also implement their own limits and enforce speed limits. Speed restrictions are based on a number of factors including curvature, signaling, track condition, and the presence of grade crossings. Like road speed limits in the United States, speed limits for tracks and trains are measured in miles per hour (mph).
The Michigan Line, sometimes known as the Chicago–Detroit Line, is a railroad corridor that runs from Porter, Indiana, to Dearborn, Michigan. It carries Amtrak's Blue Water and Wolverine services, as well as the occasional local and/or unit train operated by Norfolk Southern.
The Rail Safety Improvement Act of 2008 is a United States federal law, enacted by Congress to improve railroad safety. Among its provisions, the most notable was the mandate requiring positive train control (PTC) technology to be installed on most of the US railroad network by 2015. This was spurred by the 2008 Chatsworth train collision the month prior to passage of the act. After two delays, the technology was operational on all required railroads by the end of 2020.
The Lac-Mégantic rail disaster occurred in the town of Lac-Mégantic, Quebec, Canada, on July 6, 2013, at approximately 01:15 EDT, when an unattended 73-car Montreal, Maine and Atlantic Railway (MMA) freight train carrying Bakken Formation crude oil rolled down a 1.2% grade from Nantes and derailed downtown, resulting in the explosion and fire of multiple tank cars. Forty-seven people were killed. More than thirty buildings in Lac-Mégantic's town centre, roughly half of the downtown area, were destroyed, and all but three of the thirty-nine remaining buildings had to be demolished due to petroleum contamination of the townsite. Initial newspaper reports described a 1 km (0.6-mile) blast radius.
In rail transport, the U.S. DOT-111 tank car, also known as the TC-111 in Canada, is a type of unpressurized general service tank car in common use in North America. Tank cars built to this specification must be circular in cross section, with elliptical, formed heads set convex outward. They have a minimum plate thickness of 7⁄16 inch (11.1 mm) and a maximum capacity of 34,500 US gallons. Tanks may be constructed from carbon steel, aluminum alloy, high alloy steel, or nickel plate steel by fusion welding.
On the morning of December 1, 2013, a Metro-North Railroad Hudson Line passenger train derailed near the Spuyten Duyvil station in the New York City borough of the Bronx. Four of the 115 passengers were killed and another 61 injured; the accident caused $9 million worth of damage. It was the deadliest train accident within New York City since a 1991 subway derailment in Manhattan, and the first accident in Metro-North's history to result in passenger fatalities. The additional $60 million in legal claims paid out as of 2020 have also made it the costliest accident in Metro-North's history.
The technical investigation of the Lac-Mégantic rail disaster looked into the instigating and mitigating factors regarding the incident, one of the deadliest in Canadian railway history, with 47 deaths. It identified 18 factors related to the cargo, maintenance of the tracks, maintenance and operation of the train, and weak government oversight all combined to produce the disaster. Five recommendations for change resulted from the investigation.
On December 18, 2017, Amtrak Cascades passenger train 501 derailed near DuPont, Washington, United States. The National Transportation Safety Board's (NTSB) final report said regional transit authority Sound Transit failed to take steps to mitigate a curve at the accident location, and inadequately trained the train engineer. The train was making the inaugural run of the Point Defiance Bypass, a new passenger rail route south of Tacoma, Washington, operated by Amtrak in partnership with state and local authorities in Oregon and Washington, on right-of-way owned and operated by Sound Transit. The bypass was intended to reduce congestion and separate passenger and freight traffic, and was designed for faster speeds and shorter travel times, saving ten minutes from Seattle to Portland compared with the previous route used by Cascades.
References
- 1 2 U.S. National Transportation Safety Board (June 13, 2006). "Failure to Adhere to Track Warrant Control Rules Caused Collision of Two BNSF Trains in Gunter, Texas, NTSB Says".
- ↑ "Rail transportation safety investigation R13D0054 (Lac-Mégantic derailment of 6 July 2013)". Transportation Safety Board of Canada. 6 Jul 2013.
- ↑ "Original 'Most Wanted' List of Transportation Safety Improvements, as adopted September 1990". ntsb.gov. 1991. Archived from the original on 25 March 2011. Note: The original NTSB list used the term "Positive Train Separation," which was revised to "Positive Train Control Systems" in 1991.
- ↑ "Obama signs short-term transportation bill". Washington Post. 2015-10-29. Archived from the original on 2019-03-08.