My advice is to adopt a new line

Not knowing where she was, she stopped and asked the way on the street

If a high hill stood between A and B, it was important to decide whether the line should climb over it, pierce it with a tunnel, or make a detour to avoid it

Even after being approved, difficulties might arise in the actual construction of the line

A piece of railway in use today is therefore the product of a long series of decisions reached on many different grounds, at different times

The streetcar is now certainly out of date