pair of big cast iron house jacks heavy industrial screw jack

Pair of big heavy cast iron screw type house, or possibly railroad, jacks. These are very large jacks. Each one weighs 28 pounds!

These adjust from about 16" high to about 23" high. They measure about 7" across the jack base and about 4" across the top of the jack.

These marked "1 3/4 x 12" and an old mark I couldn't make out. They have a patina of soil, rust and old grease. There's a little mushrooming to the iron from use at the lever holes in the jack head.

These are from an estate in Oshkosh, Wisconsin and the property backed up on the old railroad yard and tracks, so maybe they came out of the railroad, I don't know.