生成关于铁路选线、地铁选线、线路优化的SCI检索式

1. 铁路选线：
- "Railway alignment" OR "Railway route selection" OR "Railway track alignment" OR "Railway line selection" OR "Railway track selection" OR "Railway route optimization" OR "Railway alignment optimization" OR "Railway track layout" OR "Railway track design" OR "Railway track planning" OR "Railway track construction" OR "Railway track survey" OR "Railway track inspection" OR "Railway track maintenance"

2. 地铁选线：
- "Subway alignment" OR "Subway route selection" OR "Subway track alignment" OR "Subway line selection" OR "Subway track selection" OR "Subway route optimization" OR "Subway alignment optimization" OR "Subway track layout" OR "Subway track design" OR "Subway track planning" OR "Subway track construction" OR "Subway track survey" OR "Subway track inspection" OR "Subway track maintenance"

3. 线路优化：
- "Route optimization" OR "Route planning" OR "Network optimization" OR "Transportation network optimization" OR "Railway network optimization" OR "Subway network optimization" OR "Network modeling" OR "Network simulation" OR "Transportation planning" OR "Transportation modeling" OR "Transportation simulation" OR "Optimization algorithms" OR "Optimization techniques" OR "Optimization methods" OR "Optimization models" OR "Optimization strategies" OR "Optimization approaches" OR "Optimization tools" OR "Optimization software"