Higher-speed rail
From Wikipedia, the free encyclopedia
This article is about rail service that is of a higher speed than conventional inter-city rail. For high-speed rail services with speeds more than 200 km/h (124 mph), see
High-speed rail.
China Railways CRH6 on the
Zhengzhou–Jiaozuo intercity railway
Higher-speed rail (
HrSR[1]), also known as
high-performance rail,
[2] higher-performance rail,
[3] or
almost-high-speed rail,
[4] is a
jargon used to describe
inter-city passenger rail services that have top speeds of more than conventional rail but are not high enough to be called
high-speed rail services.
[5] The term is also used by planners to identify the incremental rail improvements to increase train speeds and reduce travel time as alternatives to larger efforts to create or expand the high-speed rail networks.
[6] Some countries use the term
medium-speed rail, or
semi-high speed rail instead.
[7][8]
[...]
Speed limits
In Canada, the assumption about grade crossing is that operating higher-speed rail services between 160 and 200 km/h (99 and 124 mph) would require "improved levels of protection in acceptable areas".
[28]
In the United States, railroad tracks are largely used for freight with
at-grade crossings. Passenger trains in many corridors run on shared tracks with
freight trains. Most trains are limited to top speeds of 79 mph (127 km/h) unless they are equipped with an automatic
cab signal,
automatic train stop,
automatic train control or
positive train control system approved by the Federal Railroad Administration (FRA).
[29] In developing higher-speed rail services, one of those safety systems must be used.
Additionally, the FRA establishes
classification of track quality which regulates the speed limits of the trains with Class 5, Class 6, Class 7 and Class 8 for top speeds of 90 mph (140 km/h),
[30]110 mph (180 km/h), 125 mph (200 km/h) and 160 mph (260 km/h), respectively.
[31] The FRA also regulates passenger train design and safety standards to ensure trains that operate at speeds of 80 mph (130 km/h) up to 125 mph (200 km/h) comply with its
Tier I standard and trains that operate at speeds up to 150 mph (240 km/h) comply with its
Tier II standard.
[32]
Another limitation is the safety of
grade crossings which limits how fast the trains can go. FRA regulations set speed limits for tracks with grade crossings as follows:
[33]
- For 110 mph (180 km/h) or less: Grade crossings are permitted. States and railroads cooperate to determine the needed warning devices, including passive crossbucks, flashing lights, two quadrant gates (close only 'entering' lanes of road), long gate arms, median barriers, and various combinations. Lights and/or gates are activated by circuits wired to the track (track circuits).
- For 110 to 125 mph (180 to 200 km/h): The FRA permits crossings only if an "impenetrable barrier" blocks highway traffic when a train approaches.
- Above 125 mph (200 km/h): No crossings will be permitted.
In Europe, the limit is often 160 km/h (99 mph) over grade crossings.
[34] In Sweden there is a special rule permitting 200 km/h (120 mph) if there are barriers and automatic detection of road vehicles standing on the track.
[35] In Russia 250 km/h (160 mph) is permitted over grade crossings.
[36]
With the above limitations, many regional transportation planners focus on rail improvements to have the top speeds up to 110 mph when proposing a new higher-speed rail service.
[23]
[...]
Note 28:
"Deliverable No. 12 – Review of Impacts of HSR on the Transportation System within the Corridor" (PDF).
Updated Feasibility Study of a High Speed Rail Service in the Québec City – Windsor Corridor. Ministère des Transports du Québec, Ontario Ministry of Transportation, and Transport Canada. November 2010. Archived from
the original (PDF) on 30 October 2012. Retrieved 17 November 2012.