I don’t know about the particular cars that you are asking about, but Lionel, rebranded products from various manufacturerers in HO over the years.
IIRC, some were Rivarossi, Athearn, including the “Hustler” industrial diesel, Bachmann which included the GS-4 in both Daylight and Freedom Train schemes.
I believe it was about 2003, Lionel imported 4-6-6-4 Challengers and Veranda Turbines. These were Quality Locomotives, Very well detailed die cast metal, Dual mode DCC/Analog DC with sound, Very nice running locomotives.
In the Challengers, they did Six versions. In Union Pacific, they did four, They offered Black/Coal fired/ No Smoke lifters, Black /Oil Fired/ with Smoke Lifters, Two Tone Grey with Yellow Stripes & Lettering/ Oil Fired/ with Smoke Lifters and My Personal Favorite, Two tone Grey with Silver Stripes & Lettering/Oil Fired with Smoke Lifters.
They also did Rio Grande, which were locomotives diverted by the war production board during World War 2, from a Union Pacific order. After the war the Rio Grande, returned the locomotives to the WPB, and they were subsequently sold to the Clinchfield, who converted them from twin smokestacks to single stacks. Lionel had separate tooling just for the Clinchfield versions with the single stacks.
Lionel produced all Six versions of the Challengers in two road #'s each for a total of twelve different locomotives.
In the Veranda Turbines, Lionel produced two versions, one with Silver Trucks, and another with Grey trucks, I don’t recall which were the early and which were the later versions on the prototype. Again Lionel offered Two Road #'s in each version for a total of Four different locomotives.
Doug