Railways Through Time arrives as the first expansion that adds a fourth dimension to the classic Railways of the World: time. You still use all the pieces, tracks, trains, money and core rules of the base game, but now you get an innovative board that represents different historical eras. Each era functions as a separate map, and players can build lines that span centuries, linking, for example, a 19th‑century industrial city to a high‑tech future. The core "pick‑up and deliver" mechanic stays intact – you still collect cargo at one spot and deliver it elsewhere for points – yet you now choose which era to operate in, opening strategies of temporal jumps to optimise routes or block opponents. Network building remains the heart of the game, but the extra time layer makes the timing of a line placement as crucial as its location. Because the expansion only adds the board, you need the full base game components to play. The weight sits in the light‑to‑medium range (about 2.7/5), perfect for fans of route‑building games who don’t want heavyweight complexity. Playtime averages around two hours for 2‑6 players. If you already love Railways of the World or other railway titles, you’ll enjoy the novelty of time‑traveling while keeping the familiar delivery mechanics. For newcomers, it can be an appealing entry point, but remember you must own the base game first.