And that's the thing, each arrangement in real life is designed to suit the specific location, taking account line speed, traffic direction, track geometry etc. So what might be suitable in one location might not work in another. The principle reason why wires cross at points is to avoid pantograph hookover, a cross contact bar ties the two contact wires together so that as the pantograph lifts one wire, the other is also lifted to match. This is more important at high speed where trains can run in either direction on each wire. At low speeds where the wire does not lift so much it is not so much of a problem, although it would still be normal practice to cross the wires if possible. As an aside, modern high speed crossovers don't cross the wires, but they usually have something like 'cross droppers' that connect the catenary of one wire to the contact of the other, so that when the catenary lifts it tends to lift the other contact wire also. Needs much more accurate setting up to get it to work, but the end result is a softer ride for the pan. That won't be applicable to a three way though!