The bottom dropped out of the hobby, used train market several years back and hasn't changed. There are currently more trains available than buyers. The market is flooded with trains and the supply is larger than the demand because the demographic of those that buy the trains is rapidly changing.
Its a great time for the buyer as bargains abound. I was at a train show today and it was very crowded. The prices of used trains were generally very reasonable but I noticed very few people buying. Just my observation.