Loops at all ends are no problem, so if the design is modular, there's only a need to customize the trailing module for platform access, avoiding the need to monkey around with a standard cab module.

For instance, the common Church Street end of the tram/train routes is intended to be a one way terminal loop in any event, as the most effective route ...

Among the five routes ... one CBD route in stage 1, two urban routes in Stage 2, two regional routes in stage 3, there are two pure balloon loops, but one is ducking underneath a rail bridge and the other is in the dead space inside a rail triangle. The rest are routed as one-way loops.

I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.