The Red Line is a rapid transit line of the Washington Metro system, consisting of 27 stations in Montgomery County, Maryland, and Washington, D.C., in the United States. It is a primary line through downtown Washington and the oldest and busiest line in the system. It forms a long, narrow "U," capped by its terminal stations at Shady Grove and Glenmont. Route description: The Red Line begins above ground at Shady Grove, and parallels CSX Transportation's Metropolitan Subdivision (served by MARCBrunswick Line trains) to south of Twinbrook. The route then enters a tunnel and curves west to run under Rockville Pike at North Bethesda. Until Tenleytown, the line follows the route of Rockville Pike and Wisconsin Avenue in a tunnel, except for a bridge over the Capital Beltway (I-495). The tunnel curves east at Tenleytown into Yuma Street to reach the Van Ness–UDC station, curving south there to travel under Connecticut Avenue through south of Farragut Square. A curve under Lafayette Park takes the tunnel east under G Street Northwest through the Metro Center and Gallery Place stations. From Gallery Place through Judiciary Square, the line runs southeast, turning east again at D Street to reach Union Station. There it turns north and surfaces next to Union Station's platforms, follows the Washington Terminal yard tracks north to Brentwood where the line turns northwestward and again joins CSX Transportation's Metropolitan Subdivision tracks, running in a unique gauntlet arrangement with the freight railroad tracks straddling the Metro tracks. The Red Line continues in this manner northwest across the DC-Maryland line, through Takoma and past Silver Spring. It reenters a tunnel at 16th Street and heads north under Georgia Avenue to the end at Glenmont. S Rolling Stock Alstom 6000 Series
If it has significant underground stations then unlikely as DTG have admitted to struggling with light baking in TSW. The other big if would be licensing or access for research, if the operator decided they don’t want their infrastructure and train systems replicated in a game for security reasons. And yes, OP, you would get your premise over much better using some punctuation and paragraphs (not wanting to be the grammar police here ).