Switch start connector1435; Point rail1450; 1445 in the middle of turnout rail; The heel end of turnout rail is a straight line 1439, and the side face1439; The heel end of the switch rail decreases from 1439 to 1435 in the straight backward direction, and increases from 1439 to 1.5m in the transverse backward direction, with an increase of 3m (generally referred to as the first three types); The middle of the guidance curve is1450; Middle part of straight strand (generally at the middle joint)1435; Back of guide curve1450; The end point of the guidance curve is 1435 (decreasing from the back of the guidance curve to 1450, generally called the last four); Frog front strand1435; Frog intermediate strand 1435 (including 9 1 48); Frog hind legs1435; Straight strand behind frog1435; Straight strand in frog 1435 (including 9 1 48); Straight strand before frog 1435.
I. Basic concepts
Railways are the tracks of trains and other means of transportation. Railway transportation is a land transportation mode, in which locomotives are used to pull trains and vehicles to walk on two parallel rails. The traditional way is to travel on steel wheels, but railway transportation in a broad sense still includes non-steel wheels such as maglev trains, cable cars and ropeways, or rail transit.
Railway sometimes refers to a railway "line", such as Beijing-Guangzhou Railway, and sometimes refers to a collection of railway lines, including old lines, new lines or first and second lines. For example, if a new one is built in the name of railway expansion, it still belongs to the railway system.
The railway grade in the era of high-speed rail is very complicated, including road network grade, speed grade, passenger and freight grade and so on. The level of high-speed rail is higher than that of the national railway, which has some express railways and some ordinary railways.
The standard track is compared with meter track and wide track. In the trisection of speed grades, ordinary railways are compared with express railways and high-speed railways, and in the dichotomy, ordinary railways are compared with MRT railways.
Two. Basic introduction
Railway (Railway) is the track on which trains and other vehicles run. Railway transportation is a kind of land transportation mode, and the locomotive pulls the train to walk on two parallel rails. However, railway transportation in a broad sense still includes non-steel wheels such as maglev trains, cable cars and ropeways, or rail transportation.
At present, China has become the country with the fastest development, the most complete system technology, the strongest integration ability, the longest operating mileage, the highest operating speed and the largest scale under construction. With the construction and completion of passenger high-speed railways between provinces and major cities, China will form a "four vertical and four horizontal" high-speed rail pattern in 2020.
During the Eleventh Five-Year Plan period, the investment in railway capital construction in China's railway vehicle manufacturing and other related industries 1.98 brought a broad market space, and also brought new market demand to the paint industry.