OpenTTD is great but I highly recommend checking out Jan Zelenys Mashinky on Steam if you want a more modern take on this game. He's doing railroads right now but has long term plans for multiple transportation options.
Proprietary, payware, only on Steam, with empty installation instruction[0]... No, thanks.
I prefer OpenTTD as already avaliable for Linux, macOS, Windows, Android, Symbian, etc. Fully free & opensource.
So I kind a skeptical. Is the game you recommended actually allow to build complex railroads like OpenTTD does?