In the game you mentioned, the actual length of the train generally doesn't have a significant impact on gameplay other than the length you can pull. As long as you stay within the towing capacity and consider the terrain, you can pull multiple units without major issues. However, be cautious on hills or steep inclines, as longer trains may require more power and careful maneuvering. Overall, focus on balancing the weight, power, and terrain to ensure successful gameplay. Enjoy the game and feel free to ask any more specific questions you may have!