Abacus Software's add-on for Microsoft's Train Simulator has shipped to stores. The third-party expansion adds a number of new trains and tracks to the popular railroad simulation, including diesel and electric locomotives, new passenger and freight cars, and several new routes. Train Sim Roundhouse was developed by Abacus Software, and it will soon arrive in stores for an approximate retail price of $19.99. For more information, visit the official Train Sim Roundhouse Web site.