Why high-speed rail tracks are seamless rail will not expand, how to force the expansion and contraction limit?
The rail of high speed railway is a special, common rail generally only 12.5 meters or 25 meters, the train will have a "BAM BAM" sound, if you drive too fast train will be in danger of subversion.
Seamless jointless track set 1-2km according to the line of the expansion area in CWR rail will set between 3-4, according to the temperature change of rail locking local mild, each year on the CWR stress release, blocking the line after the lift rail expansion area, all open fastener seamless line, which will make the stress of rail after the release, the rail cutting or replace the expansion area, re locking rail. This prevents rail or rail breaking.
The tracks are produced by steel mills by special data, and their technical content is not comparable to that of ordinary rails.
So the average rail limit is 140 kilometers per hour. This is undoubtedly a bottleneck for high-speed rail. Therefore, high-speed rail rail all take 1 kilometers or even a few kilometers, to reduce wheel impact force.
