You all have been very informative & I appreciate all your feedback, I have a much clearer idea now! Thank you!!

I was handed down a collection from my father, he was 65 when he passed & I never knew he had them. They're unused, unopened. I can't find a date on any of the boxes but I can tell they're old. Here's what it consists of... & it's all Bachmann.

Simplimatic Plug in wiring
Lighted Chessie System Locomotive
Over Under Blinking Bride tessle Set
Triangle Pacific
Chessie System b&o Wide Vision Caboose c3969
Dome Tank Car Amer. Cynamid
All Door Box Car Netherland Overseas
Power Pack UL Listed

I was actually trying to sell them on Craigslist & I recieved a call saying that they could be worth more than $100.00 (what I was selling it for) & I should do my research on this site before selling them.

So, I am inquiring if anyone knows how I can find out how much they'd be worth? Here's a picture of them: