Scotty,
That makes sense then. And, yes, starting out on the "big machines" ruined me for the rest of my life for wanting to work on anything small ever again. If it doesn't take a slugging wrench (sorry - flogging spanner to you) to tighten it, it is just too small to mess with.
But, part of my early training and experience was on Gas Turbine driven gas compressors on pipelines and offshore platforms, so I lurked in that world too.
Some were the size of the title of the OP although most Frame 5's (and Frame 3's) used in compression were 2 shaft machines. I guess this paragraph makes this post OT.
As I understand it, Frame 5's are now produced by GE Oil & Gas out of Italy even if they are purely power generation machines. I don't think Frame 3's are manufactured any more but can't state that as a fact.
rmw