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As far as expansion is concerned, way back in the 1960's in an engineering class our professor asked us to calculate the thermal expansion of a one mile section of rail with a temp rise of 20 degrees F. , then calculate how much it would rise in the middle if both ends were held absolutely...

Saw this on Russian Steam Locomotives > https://www.abandonedspaces.com/uncategorized/the-steam-train-graveyard.html

It's not easy to jump a train going 60 km/h or better (and they usually cannot stop in less than 1.25 km when something is on the tracks).

Ferro has rails! When you are bidding, figure in about $2 a railroad mile to get it shipped where it is going. And, since it will be a part of a unit train, it may take several weeks to move any appreciable distance.