According to the Wikipedia, Colonel Stapp's peak g-force was 46.2. He lived to 89, but suffered life-long vision damage from the last test.
Zero to 760 in 41 seconds averages about 0.85g. High enough to plaster your phone to the back of your seat, but not high enough to injure you.
A 1972 proposal in the LA Times from RAND -—
http://www.reptoids.com/Vault/Underground/LA2NYnHalfnHour.htm