K. Smith gets it wrong as usual:

They're properly engineered because unlike a pleasure craft prop
shafts they're designed down pretty close to the line in that a shaft
carrying substantial HP AND the prop's thrust/vibration etc over
sometimes a reasonably long distance needs lots of proper lubrication &
support bearings,not bushes but big roller or ball bearings;

The line bearings are plain bearings, bushings if you like or split
shells supported in large bearing blocks, each incorporating an
independent oil sump and sometimes a cooler. Lube oil is supplied to the
bearing by use of a simple ring of larger diameter than the shaft. The
ring hangs on the shaft and friction between the shaft and the oil film
drags the ring through the oil sump, carrying oil to the top of the
shaft where it spreads out by gravity and lubes the bearing surfaces.

Rick