https://morningbubbles.com/2021/05/13/amtrak-promo-codes-discounts-for-may-2021/ To use a promo, simply enter the 4-digit code in the “Promo Code” field when booking at Amtrak.com or the “Coupon/Discount Code” field when booking in the Amtrak mobile app. In lieu of a code, some promos link to a special page on Amtrak.com. Upcoming 2021 Amtrak promo code blackout dates: May 28, Jul 5, Sep 3 & 6, Nov 23-24 & 26.28 ...