Hello O scale World ......the 30's were all about the streamlined look in design ...making everything sleek with minimal details to accentuate the strong sweeping curve lines . Raymond Loewy was the master of the decade creating many of the iconic trains , cars and coke machines we have all admired. please see link for more info about Raymond
https://en.wikipedia.org/wiki/Raymond_Loewy
The 1939 NYC World's Fair was the height of the streamlined movement ...( war is waging in Europe ..but here in the USA we're going to the fair . The Eastern Railroads joined together to put on a huge pageant to promote rail travel and illustrate the vital role the railroads played . Two large O scale layouts were built ..employing many model makers and most of the O scale manufacturers building specialized engines and cars to endure the long hours of daily running .... using ball bearings in the wheels sets..the new 2 rail operation ..and designing generic looking engines so no one railroad would have sole identity ruling the layout .
Bill Walthers .... provided some of the engines for the Fair using the new Poly-Drive gear box ... and a fully streamlined steam engine and set of matching smooth sided cars to flash around the layout in lighting speed.
Bill added the streamlined steamer and matching cars to the catalog in 1940 ... the pieces reappeared after the war in 1946 . Judging by the remaining examples ..it may not have been on the best sellers list.
So you be the judge who designed a better looking streamlined engine ..... Ray or Bill ?
Below you have an Alexander S1 ( original designed by Loewy) along side the Walther's streamliner ...both from 1939
If anyone has a set of early Walther's streamlined cars ..I'm in the market