The following aspects are introduced in this paper,such as the design of tower structure for vertical turning of steel tube arches and its drawing and turning system,the construction check and calculations and the construction monitoring ,the construction technology of vertical turning, etc.

Based on some experiments, the mechanism of these key factors in the drafting system on yarn quality is analyzed.

LIM traction system of Guangzhou Metro Line 4 vehicles;

Electric traction system of metro vehicle for Beijing Batong Line;

Design of 4-pulley wagon-relocating traction system;

Hauling System for Cable Erection of Runyang Suspension Bridge over Yangtze River;

The key technologies in design and construction of the superstructure of Runyang Suspension Bridge,such as the erection of catwalks,the main stand hauling system and special lifting equipment for steel girders,are presented.

In consideration that the numbers of the wire strands of the Suspension Bridge of Runyang Changjiang River Highway Bridge are great and the strand hauling distance is long, the single-rope, round-trip hauling system is used for erection of the catwalk strands, while the double-rope, round-trip hauling system is used for erection of the main cable wire strands.

From the view-point of a large scale system, this paper regards a substation, a tractive electric network and many electric locomotives running along contact lines as a system——the electric traction system, we set up the state model, the related electrical property model and the economy model of the system.