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You do not need every DLC to enjoy the game. Many players recommend focusing on specific regions (UK, US, or German) or types of locomotives.

Unlike many games, Steam shows achievements for the base game and all its DLC. To get a "100% completion" ribbon, you would typically need to own and complete scenarios for every piece of content that includes achievements. Essential Starter DLCs train-simulator-2015-100-dlc

Achieving 100% in Train Simulator is a significant undertaking due to the sheer volume and cost of content. You do not need every DLC to enjoy the game