Hi RF383, I don't have any post war Lionel, I have read a little about the remote control set, it was very advanced for it's time, and a pretty low numbers produced set.
Yes the values have declined, the Post War Lionel market peaked in the Mid 80's to late 90's. In that time frame many of the men who were boys in the 50's and 60's were at a point in their lives where the Kids were out of College and the house, they were well established in careers and doing well, with disposable income available, many started yearning for, and able to afford the "Neat Things" that they couldn't afford as kids, so the values really went crazy. Sadly that market is shrinking, and the Post war values with it.
Pristine Collector condition items still command decent prices, but the "Well Used" runners market has fallen. There are some younger people who still appreciate the simplicity and durability of the vintage trains, but the supply is definitely greater than the demand in that niche.
Trust me there is the CAD equivalent in Model Railroading, the average model railroader is a hoarder that would put all but the worst cases of CAD to SHAME. I Personally have equipment in "N" scale, "HO" scale, 027, "O" Gauge, "O" Scale and Gauge #1 which most people call "G" Scale/Gauge, but there are about half a dozen different "SCALES" that all run on Gauge 1 track, that niche can be so confusing that it can frustrate even some advanced/experienced modelers. I Have a Lot of HO, and "O" with the "O" being my Favorite, there is a lot of really nice semi-scale 3 Rail O Gauge that can operate on sharper curves, but then I also got drawn into the Scale Size 3 Rail O equipment, I have probably more a dozen Locomotives in the price range of a 395XP to a 3120XP, with more in the 550xp-372xp price range, though they are not all that expensive, if I had to guess, just in O and HO, I have around 75-100 locomotives, in O alone, I have probably 50+ Passenger Cars, and 250+ freight cars, add in track, accessories transformers, buildings tools etc, I could open my own well stocked small Train Store, enough to drive my Wife NUTS, enough so that she ENCOURAGES my CAD/CSMAD. I have gotten to the point where I will probably start selling a lot of it this Winter, when I have the time to ebay it, and the market for those items is stronger.
I'm afraid that with my limited vintage experience, I can't give you an estimate of your set, but CONDITION, and RARITY are what will have the greatest effect on value.
Good Luck with whatever you decide to do with that set, it should be a very desirable set depending on condition
Doug