I haul on one of the servers I play only pax. As pax hauler you have a lot of disadvantages compared to cargo haulers.
There are very less pax competitions, licences are sometimes very rare.
You have to use a lot of money in the beginning to build your train station and lab simultaniously. Don't mention the cost of connecting cities and often very low income compared to cargo.
I would like to see a better division between the costs, income and other game features such as competitions etc. between cargo and pax.