The general rules of thumb I've run across for hauling by horses for actual work and not tractor-pull style demonstrations:
1/10 of body weight in dead weight (like a plow or log)
1.5x body weight on wheels on road
5x body weight on rails
So a 75 ton loaded rail car will need at least 15 tons of horse to pull. Figure around 10 draft horses or so.
That's also assuming level track and a relatively low speed (circa 8km/h or 5mph). Hills will need a "booster" team to help haul, and teams will probably need to be swapped every 3-4 hours (let's say 4 just to make it equal to a travel period).
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The poster formerly known as The Dark
The Vespers War - Ninety years before the Twilight War, there was the Vespers War.
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