The first Standard O (scale) F3's were 2002.
Starting with the F7 RickO has pictured, Lionel changed the chassis, motor, and tuck design. The new design, which was also used on the E7's and possibly others caused the F's and E's to ride high over the trucks. (Sam, look at your breakdown B). There was another issue at the time which was that each truck only had one axle powered. There were a lot of complaints on the forum about the 2 wheel per truck drive and the "high water look"
I owned the F7's and a later conventional Standard O F3 that Lionel produced to get rid of those drives. The pulling power was NOT an issue, those units pulled within a car of the earlier 4 wheel drive trucks. I had a lengthy test to verify that. Most of the complaints were probably from people that didn't own the engine. Those units had RS5 sound. The next generation brought about Legacy, 4 wheel drive trucks and the gap between the truck and the body was narrowed.
Regarding the Santa Fe F7 that RickO pictured, there were some features that got overlooked because of the complaints about the new drive. The lighting was very special. The top light included a Mars light and a red signal light that came on when the engine stopped. The lower light had a twin sealed beam look with 2 LED's. The problem with anyone noticing the twin sealed beam look (you can't see it in the picture) was Lionel used a lens that didn't allow it to be seen. If they had used the appropriate lens it would have added significantly to the scale looks. I owned the engine 2 years before I noticed it.
Rick O is correct, the RS5 sound is spectacular and if you have the breakdown B, which had better sound than the A, it is amazing. The reason the Breakdown B had better sound was because they had the room to baffle the speaker better and it provided significantly more bass.