联锁(Interlocking)是一个铁路名词，为道岔、号志和进路三者间的状态查核与互锁的关系。

为保证行车安全。

In railway signalling, an interlocking is an arrangement of signal apparatus that prevents conflicting movements through an arrangement of tracks such as junctions or crossings. The signalling appliances and tracks are sometimes collectively referred to as an interlocking plant. An interlocking is designed so that it is impossible to display a signal to proceed unless the route to be used is proven safe.