Amtrak is having a buy one get companion fare free on any of their roomette/sleeper car bookings. This offer is valid on California Zephyr, Coast Starlight, Empire Builder, Silver Star, Southwest Chief, Sunset Limited and Texas Eagle.

Amtrak [amtrak.com]
Promotional Code: V550
Book by October 14, 2019
Travel November 11-April 8, 2020

All prices will be automatically discounted from the standard fare when accessing this promotion at amtrak.com/roomette/bogo, or by using the discount code V550 when booking their trip.