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This addresses some of the concerns I've had in the past on codes posted in the Amtrak forum. Some are public, some for Guest Rewards members only and many others for qualified uses. I'm particularly uncomfortable with the ones that post a code with zero information - no expiration, requirements, exclusions, etc.
Admittedly, Amtrak's discount codes aren't exactly rocket science, and even with eligibility requirements one can usually get around the human checks using an automated ticketing machine.
Regardless, improper use of codes ultimately hurts the company involved financially, and in the case of qualified discounts, could harm the relationship with the organization that secured the discount. I also wouldn't want a company to have the impression FlyerTalk is encouraging members to find, post and use discounts they should not be receiving.