from what i have heard is that all earlier bachmann trainsets where quiet nice at the time but every 5yrs it seams like they update everything and many of their older things like the 4-4-0s and the f series diesels are not worth as much as you think because they were heavily mass produced and at flea markets and swap meets you can find whole boxes full of these listed at $10 each because they still make them in much better running condition. most of the time any plastic model train that was built between 1960 and 1990 lose price every year. if you have the money and enjoy trains enough you might try collecting Lionel tin plate or brass trains because they are collectors items and some model railroaders use them with upgrades some of the most collectible i think is pacific fast mail or if you don't have the money but want to collect something that people would buy i would suggest mdc/roundhouse, ahm, and pocher. the roundhouse shays are especially popular because people often but them to kitbash them. and also welcome to the hobby if you want the best information i would suggest going to a trainshow or swap meet