The best simulation games understand the minute details. Cities Skylines gives you everything you need to build an entire city from scratch, Euro Truck Simulator puts you in the driver's seat for the long haul, and even Factorio presents you with some incredibly in-depth manufacturing. Railroads Online does the same for the golden age of trains, except you can also work together with friends to bring about locomotive bliss. With a 30% off sale right now, loads of updates over the years, and a newly teased full release date, now's the perfect time to dive in.