The picture looks similar to a triangular train diesel I saw in the train museum in York, England. There were three crankshafts at the corner points of the triangle and at each journal there were two pistons going into the two legs of the triangle for a total of six pistons for each band of cylinders. I can't remember how many sets of cylinders there were but I'm guessing six. This would make a total of 36 pistons. The compression was created by the pistons compressing against each other. I believe the crankshafts were geared to a single output shaft in the center. It was one of the most aesthetically pleasing engine designs I have ever seen.
Can anyone comment on he power production of these opposing cylinder engines as opposed to single pistons compressing against a fixed surface?

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13