Yesterday a train passed by with like 40 train cars and I was astonished by how these trains can even move with that much cargo behind it. How is this even possible?
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The strength of a motor or engine (something that does rotational work) is not just measured in how fast it can turn, but how hard it turns (torque). Goods locomotives produce a lot of torque to overcome the inertia of the loaded wagons and then work carefully with their momentum. They don’t like hills or unnecessary stop/starts. For really really long trains you can sometimes run several locomotives that work as a team, depends on the model and operator
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