Certainly! Here's a simple description: "After booking your train ticket, you can often upgrade your seat or service class, depending on availability. Upgrades can usually be done at the station or sometimes online, closer to your departure time. It's a good idea to check with the train service provider for specific policies and availability, as this can vary. Upgrading allows you ... https://reservationsus.com/are-there-sleeper-cars-on-the-train-from-chicago-to-seattle/