OpenTTD (2004)

A shared station and a well-designed junction can connect industries and towns far more efficiently than a collection of isolated services. Learn the path signals as the railway grows, and enable the built-in passenger or cargo distribution options if you want destinations and transfers to drive the network. The free game offers generated maps and scenarios, with plenty of settings to shape the challenge. Its older interface needs some patience, but the reward is a transport system you can keep extending.