The trains I've used, post superliner, are the California Zephyr and the Grand Canyon.

The CZ I've done at the holidays and in the springtime. I've done it with three sleepers and with two.

When there were three sleepers, it seemed pretty easy to upgrade.

When I did it with two (and that included one holiday trip and the "in the school year" springtime trip), the car has been full.

I did Trains 3-4, the Grand Canyon (or as GBN described it, the old AT&SF 3-4 mail and express accommodation), aka the Southwest Chief, last Christmas.

The train was packed.

Place your bets!

Good hunting, John

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The City of Saint Louis (UP, 1967) is still my standard for passenger operations