Yeesss!
During these times many things were tried out, and some were found to be good, others were abandoned.
Like the french Velox boilers, quick to launch, but to much auxillary systems, not a good game.
Even ti Still Locomotive. A good idea, to use the heat of the diesel for getting steam and exhanding in a steam engine, but to much systems around, so less efficient.
Or why didn't Steam turbine locos made the game? Well, as long a the engine travels with one speed, one load and on plain track, the turbine if very efficient. See on ships! 2000 Miles, and a steam turbine would be much mor efficient than reciprocating engines. But, as in trains:
There were shifting actions to do, load changes, and on traks: There are hills... and speed limits. So the turbine lost efficiency, because could not realy run allways on the edge of best efficiency, and blow or above this edge, well, most Diesel and reciprocation steam engies are good engough to compete!
That's why in ships most have the steam turbine for trans-ocean travels, and use small diesesl or gas turbines for the port manouver actions or other motions at often changing speed and direction actions.
And as allways, there is a BUT:
but many engines, with were not mentioned in the list, were worth to think about:
Henschel build for south africa reciprocation steam locos, which had a condensator tender. Those onto the war type condensator loco type 52 K basing engine is still able to compete with diesels, because coal is much less expensive than diesel in south africa.
BUT: as common: Steam locos are seen as unmodern, thus steam is abandoned, and expensive diesel locos are bought.
David Wardale reconstructed the famous loco type 25 NC (NC = Non-condensed) to the 'Red Devil' type, and very advanced steam locomotive. Timken Bearings at all axles and all motion parts of the gear. A modern coal combustion system and a superior exhaust system with a very modern fedd water preheating process... David Wardale tested and found, that those engines can simple compete with modernest diesel engines, but: Still look old, thus were not considered to be used. So he abandoned the second step: Combine 'Red Devil' and the Henschel condensator patent to a very efficient and powerfull locomotion.
And there a still many other things, unusuall for us now, but maybe futhcomming someday.
Fuel will be getting more and more expensive. so how manage this problem? Steam is in a very good position, but also wind engery maybe a guess.
So, what's with the horizontal rotors, once used be J. Cousteau build an his ship Alcyone two of these rotors, as replace for comon sails, and foud them very usefull. The Flettner turbo sail, as usually named, wasn't build after Couteaus death onto the planned Calypso II,which construction was abandoned.
So could we today imagine a huge freighter with Flettner turbosails?
Is Queen Mary 2 and her diesel electric propulsion system with two additionally gas turbines realy state of technology?
All, in my opinion, a point of view.... Very hard for me, to imagine a passanger ship like 'Sea Star' 'Arosa' or other with turbosails.. How would the look like?
So, could we image ship with a more modern nuclear propulsion system? Large carriers vessels and submarines use it, many huge vessels and cruisers were tested... So backdraw is still the radiation and the problem with the 'nuclear waste'.... but in future?
Should we abandon nuclear technologies? Can we imagine nuclear driven passenger ships? Well, hardly, for me....
So the point of view is often very narrow, and what today seems hardly or difficult to image, maybe in future whats running the world.
So today unusuall, tomorrow very common. Yesterday many things seem to us now unusuall, but had been a thing to test and trail in the past.
Sincerely,
Steffen