Described are the features, main technical parameters, structure and testing of the N type special flat car and the yellow phosphorus tank box.

The development process and perform- ance parameters,structure dimensions and test re- suits of the NP_(70) special flat car with removable roof for transport of steel rolls are described.

Based on the three dimensional,steady and incompressible Navier-Stokes equation and k-epsilon turbulence model,FLUENT was adoptted to carry out numerical calculation of aerodynamic forces on special container flat wagon(container flat car for short)running on embankments in environmental winds.

Based on unsteady N-S equation of three dimensional and compressible viscous fluid,the aerodynamic performance for the fast special container flat wagon at the speed of 160 km/h was calculated numerically by adopting the technology named slippage grid.

Reconstruction Design of End Face Spiral Oil Bath Special Lathe;

This paper introduces the design scheme to transform the common lathe of C6140 into the rub flat end face spiral oil trough special lathe.

Discussion on the lightening design of special purpose vehicle;

This article introduces the development of national special purpose vehicle and their test state,analyses the influence of our national policies1 on the development of special purpose vehicle,forecasts the development of special purpose vehicles and point out some viewpoints on them.

According to operation characteristics of special purpose vehicle and theory of medium propagation.

This article has forecast the market needs of special vehicles in coming three years in southwest China,based on the research and analysis of highway traffic, basic build in nearly time, and special vehicles sales in recent three years in these areas.