The paper analyzes the benefit of heavy-load transportation capacity expansion of Daqin railway,considers that the benefit analysis should aim at economic benefit and social benefit and uses a practical example to prove that heavy-load transportation is an important way to get obvious benefits.

so as to providing the base for heavy-load transportation plan on Daqin line.

Railway heavy haul transportation is used to transport large amount fr.

Four grades of priority are defined in the goal programming model according to the practices of heavy haul transportation in China railways.

Dalian-Qinhuangdao line is a heavy-haul transportation line in China.

The present and problems of Datong-Qinghuangdao railway are introduced in the article as the railway opened to traffic in 1988 and promise of heavy-haul transportation is described.

The heavy-haul transportation mode has been applied in China railway,and it will deveolp rapidly,it affect the shunting operation of marshalling yard directly,so we will research the new speed control design system and new speed control equipment to fill the new requirement of the development of the heavy-haul transportation.

On the ba- sis of heavy haul transport conditions,the develop- ment thinking of heavy haul wheels in our country is put forward and the test steel is developed according to it,the laboratory and industrial trial manufacture are accomplished.

The fundamental techniques and economic features of railway heavy haul transport and mixed transport of passenger cars and freight cars are analyzed in detail.

The innovation thoughts in heavy haul transport in South Africa are described generally.

It is considered that there would be necessary to study the technology,and expriences on heavy haul traffic abroad,so as to work out the plan for developing the heavy haul tr.