@BillYo414 posted:…I wonder how they ran on compressed air? Just plumb a big storage tank into the engine and pull it along on a flatbed?
The “…big storage tank…” is the boiler. They connect an air compressor to the boiler and run it…for long time. Once the boiler is pumped up to whatever pressure the compressor can achieve, the compressor is disconnected and the engine can move. We’ve done it with 765 several times.