The Basics

Pick up all passengers with your train. As you pick up passangers your train becomes longer and you should make sure you are never locked in by your own train.

Difficulty

As far as I have played it seems too simple, there is always a way to take a big detour as a safe way to get to remaining passengers.

Variation

The tracks configuration changes, but that is it.

Visually

A bit too simple.

Free vs Paid

Many ads that can be removed for a small amount.

Is It Any Good?

I give Train Taxi 5 out of 10 stars. Too simple, too many ads.