“cross” is not a very helpful description of a subway route, unless it is a city so small that it shouldn’t have a subway. For the route to cross a city, it can be east-west, north-south, or any angle; and it can start in the outskirts and connect with other inner-city routes. Routes in major cities like London in England have criss-cross lines of below-ground and above-ground trains each with different twists and turns based on population and terrain.
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