How many guys thought investing their money buying model trains in the 1990's was a dream come true the second time over. The values could only go up as did those original 1950's "pricey" postwar items they wish they could have bought when they were young.
I just looked at a Collector's Gallery article in a 1995 edition of OGR Magazine on the OGR Digital Archive DVD - really neat to see in 2015.
Ed Boyle wrote an article about a Lionel 16681 Aquarium Car that came out in late 1995. His intuition told him this car was going to be a real winner and decided to buy up a bunch of them to gain on his investment. Cars came out at around $35 and immediately rose in value to $70 to $90 on the retail market. The key word is "retail."
I hope he sold the ones he had because now (2015) if you tried to sell this car on the "retail" market - good luck. This "old" collectable Lionel Aquarium car is now a car no one wants even at $24 or less, mint in it's OB.
As the train sage says - "Buy it only if you like it" because it's never going to be an investment piece. With the way kids are now - don't save them on the shelf. People are trying to sell these $2,000 steamers and diesels on the secondary market but what are they really worth? Good luck with your investment.
Run them now for your enjoyment or sell them before no one wants them!