Metropolis' Marvel - Stronger than a Locomotive

Stronger than a locomotive
This superhero Fermi problem is just like the last Spider-man one so we'll use it as warm up.

In Matt Wagner's Trinity, Superman catches an out-of-control train (with say 6 cars again) that comes off it's tracks as it rounds a corner. He brings it to a stop before it can hit any buildings.

How much force did the Man of Steel use to do this?

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