I am looking to put together a campaign set in a low to no magic setting that centers around a wild west vibe wherein The Party (tm) will be put in charge of managing a railroad line currently under construction. We have only really ran D&D 5e or a d20 modern variant here on roll20, so I am looking for help or suggestions to help narrow down what systems roll20 has available that would match the style of the campaign I'm looking to build and possibly be relatively easy for mostly D&D players to pick up.