I wonder what ca2zhawkeye's actual concern about altitude is and how much adaptation he or she needs or is expecting. If you fly, you routinely go from airport altitude to a cabin pressure altitude of 7,000 to 8,000 in about 30 minutes and then back down at the destination. If you drive I-70 west from Denver over the continental divide to Silverthorne (bottom of the descent from the Eisenhower Tunnels under the divide), you will go from Denver's altitude of 5,280 to over 11,000 feet and back down to about 8,800 feet in a little but over an hour. And from Sacramento, I can drive to my home in Reno in about two hours going from sea level to about 7,200 at Donner Summit and back down to 4,500 in Reno. All of these are far faster altitude changes than you'll do on a train since trains are never as fast in the mountains.