I rode Amtrak's 51-hour 'California Zephyr' train from Chicago to San Francisco, and it turned out to be one of the best experiences of my life.

Timestamps, by order of smoke stop:
0:00 - Chicago, IL (0h00m)
3:54 - Ottumwa, IA (4h56m)
4:56 - Omaha, NE (9h15m)
6:54 - Denver, CO (19h20m)
9:47 - Fraser, CO (22h21m)
12:43 - Glenwood Springs, CO (25h59m)
14:07 - Grand Junction, CO (27h57m)
16:44 - Salt Lake City, UT (35h39m)
17:17 - Winnemucca, NV (42h56m)
18:26 - Reno, NV (46h01m)
20:51 - Sacramento, CA (52h20m)
21:57 - Emeryville, CA (53h51m)
23:10 - Austin, TX (final thoughts)

Music used:
Chicago Diner by Kota the Friend
egyptianpools by jinsang
Black Star by Radiohead
A Toast and a Spirit by Vacation Manor
Slow Dancing in a Burning Room by John Mayer
Vienna by Billy Joel
Patience by Guns N' Roses
Blue Indian by Widespread Panic
Californication by Red Hot Chili Peppers
San Francisco by Scott McKenzie