High Quality Content by WIKIPEDIA articles! Rail Sim Pro (fully Railroad Simulator Professional Edition) is the next railroad simulator from Auran Pty. Ltd., a software firm based in Brisbane, Australia. RSP is a follow-up to Auran`s popular Trainz franchise series. One common misconception is that RSP will be another installment in the Trainz franchise, but in reality, it will be all-new code, rewritten from the ground up.