Among the four key factors for the 1500V DC contact rail system, it is suggested that thefocus be placed on the system design and the product manufacture standards.

Tows the power supply system in view of the URT transportation to use the rails backflow to have the stray currents question,unifies the DC 1500V power supply service pattern power supply to be away from long,the voltage drop small merit,proposed uses the DC 1500V fourth rail technologies to come the question which the thorough settlement stray currents produces.

Composite technology and die design for steel-aluminum conductor rail;

It is introduced in this paper the composition and installation techniques of conductor rails in the urban rail transit power supply system.

Analysis of abrasion test between metro vehicle′scollector shoe and contact rail;

The contact rail system of Songjiazhuang park station is composed of steel-aluminum contact rail and GRP guard shield.

4 line of Guangzhou metro,steel-aluminum compound contact rails were installed and fed by DC 1 500 V power supply system.

To identify the characteristics of wheel/rail contact irregularity in crossing zone of high-speed turnouts,a numerical model was set up based on the least distance searching method and analyzing the structures of point rail and wing rail.

Studies on the frictional temperature of wheel/rail contact are briefly reviewed.

Results,such as the wheel/rail contact force,contact status and wheel/rail stress distribu-tion,are obtained.

A solution approach based on MATLAB software programming is proposed to find rapidly teeth surface contact locus of spiral bevel gears.