Most of these are pretty silly, but a few are worth playing. Here are descriptions of each scenario. Profitable transport services include oil from the oil rigs to Aberdeen Refinery, passengers and mail from Edinburgh to Glasgow, and wood from the forests in the north to sawmills. I'm not sure how well the AI is able to handle these layouts since they aren't the usual no-brainer type. The company that you own hasn't done anything except paying interest on its loan.
Most islands have a town or industry.
There are a lot of coal mines, setting up coal transport services can be quite profitable. Also good are passenger services between islands, either with ships or trains. Transporting oil from oil rigs to refineries may also be profitable. Set up air service between them for a fast profit. All the towns are small, so passenger transport is limited.