those look like 12H 74.
Driven at a 2 to 1 batter.
When I last did H pile, it was 1980 and we did verts and a row of 3:1 out in front. It was for the landsburg bridge over the Cedar River.
I had a live train track that we had to hang the counterweight over. We needed a schedule.
Tracks have since closed down.
It is the site of a whitewater slalom course.
in the map view, you can see the old road and bridge location downstream, and the Milwaukee Railroad grade.
Our crane was a 1960 Lorain 50 ton truck mount with massive 6 cylinder Continental Industrial engines. The lower was 820 cubic inches.
The Lorain had old school banana style outriggers, They went down as they slid out the chassis. Banana-shaped box tube. Only the one cylinder to operate, similar to this.
The hammer was a 28000 pound slug air hammer. It would drop the 28000 pound hammer 3 feet at 40 blows per minute. It made for impressive numbers.
It was driven by a 1300 CFM air compressor similar to this.
There are a lot of stories out of that job, but wrong forum I know.