Traffic lightweight is an important measure to reduce "carbon emissions". The characteristics of aluminum / magnesium light alloy determine its inevitable choice as a vehicle lightweight. Promoting the development of aluminum lightweight has become a general trend. Aluminum alloy profile for rail vehicle structure is mainly used for manufacturing rail vehicle body. Aluminum alloy profiles have the characteristics of light weight, good formability, high strength, corrosion resistance, recyclability and so on. In recent years, aluminum and aluminum alloys have been more and more widely used in the field of rail vehicles.

In France, aluminum alloy materials were used in the window frames of railway passenger cars very early; In 1905, Britain also used aluminum alloy to make exterior wall panels and interior decorative materials for trams; From 1923 to 1932, the United States used a large number of aluminum alloys on railway vehicles to manufacture doors and windows, roofs, exterior wall panels, interior wall pipes, bogies, wheel cores and decorative materials of electric vehicles and passenger cars. Later, it was developed to an all aluminum structure vehicle whose basic structural components were all made of aluminum alloy.

Aluminum profiles are widely used in rail transit. They can be used to make car bodies, such as roof, side wall, floor, etc., and small accessories, such as luggage racks, doors, pedals, water tanks, etc. Aluminum profile is used to replace steel material, which greatly reduces the weight of the train, saves energy and reduces emissions. Due to the weight reduction, the train is easier to control and more stable in harsh environments such as turning, rolling and so on. Generally, high-speed trains with a speed of more than 250 kilometers per hour are made of aluminum alloy.

Because the density of aluminum alloy is only one third of that of steel. Under the same conditions, compared with the copper containing wear-resistant steel car body structure, the mass of the stainless steel car body can be reduced by about 15%, and the mass of the aluminum alloy car body can be reduced by more than 35%. Due to the mass reduction, the traffic volume of the aluminum alloy car body can be increased by 10%.