Adding to the problem, most passenger trains run on track owned by freight railways.
另外一个问题是，绝大多数客运列车运行在原本属于货运的线路上。
2
Many HSR lines may be constructed in common corridors with freight or conventional passenger operations.
许多高铁线路，都被设计与成货运线路或传统客运线路相同的轨道。
3
These tiers could categorize methods of operation in conjunction with safety improvements such as separation of passenger and freight traffic and advanced train control systems.