Thanks to Chris / CopCarSS for my avatar.
im pretty sure the major difference is in the firebox......youd have burners instead of grates.....brickarch??? ....not sure
coal to oil wasn't too bad; oil to coal would have been a bear -- except when the engine was converted from coal to oil then back to coal. UP did that with, I think, some of the Challengers and maybe some of the FEFs, and I think some other roads did too. Partly because supplies of coal were a little uncertain just after WWII.
Diesels had so many other advantages over steam that the oil/coal question just wasn't a factor. (OK, OK -- I know that the comparison of the Niagaras to the Es on the NYC was just about a wash -- but the Niagaras were brand new, and used on such trivia as the 20th Century, and were very very well maintained in first class facilities -- hardly representative of the average steam engine in 1950 vs. the average diesel).
Not to mention the fact that a diesel is a lot cheaper to maintain in general than a steamer...
-Dan
Builder of Bowser steam! Railimages Site
Take a Ride on the Scenic Line!
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