This was played by the Dead several times in 1970 acoustic sets. This isn't same as the better known Leroy Carr song, and I think it comes from the version by Frank Stokes in the 1920s: the tune and guitar playing are very similar, though the lyrics are different. This is the version that Garcia sang.
Now listen to me mama, I can't sleep no more
Around here baby, how long, how long
Ain't had no loving, how long, how long
Hate that train, train that carried my baby away
Left me standing, how long, how long
Ain't had no loving since my baby been gone
Now listen to me mama, mama, why did you make me go
Around here, baby, how long, how long
Ain't had no loving, how long, how long
I hate that train, train that carried my baby away
Left me standing, how long, how long
Ain't had no loving, how long, how long