Gunrunnerjohn, I am curious about your reply.If you're using free-rolling modern freight cars with needle-point axles, you should be able to pull 18-20 on level track without too much issue. The rolling resistance and grades are the major determining factors in how may cars you can pull.
Did you notice overheating or other adverse effects to the engine pulling 10 cars? Also was it a diesel or steam engine? Were they freight or passenger cars? Asking because I assume the tender on a steam engine counts as a car and aren't passenger cars generally heavier than typical freight cars and have slightly more drag due to the electrical pickups for the interior lighting? Of course not all freight cars are equal in weight either.I stopped at 10
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