It's about Neal Cassady's passing, and Cassidy Law's birth.
"Catch-colt draws a coffin cart"
Lyrics written by Barlow in Cora, Wyoming, February 1972.
   
      |      | 
       | Grateful Dead Anthology  Songbook | 
   
   
      | 1972 | 
       2/14~ | Ace  LP by Bob Weir | 
   
   
      | 1972 | 
       2/14~ | Weir Here: The Best of Bob Weir  CD by Bob Weir | 
   
   
      | 1974 | 
       3/23 | Dick's Picks, Volume 24  CD | 
   
   
      | 1976 | 
       6/09 | Road Trips Vol. 4 No. 5  CD | 
   
   
      | 1976 | 
       6/10 | June 1976  CD | 
   
   
      | 1976 | 
       6/11 | June 1976  CD | 
   
   
      | 1976 | 
       6/14 | June 1976  CD | 
   
   
      | 1976 | 
       6/15 | June 1976  CD | 
   
   
      | 1976 | 
       6/17 | Dave's Picks Volume 28  CD | 
   
   
      | 1976 | 
       6/18 | Download Series Volume  4  CD | 
   
   
      | 1976 | 
       6/19 | June 1976  CD | 
   
   
      | 1976 | 
       9/24 | Dave's Picks Volume  4  CD | 
   
   
      | 1976 | 
       9/25 | Dick's Picks, Volume 20  CD | 
   
   
      | 1976 | 
       9/28 | Dick's Picks, Volume 20  CD | 
   
   
      | 1976 | 
      10/09 | Dick's Picks, Volume 33  CD | 
   
   
      | 1976 | 
      10/10 | Dick's Picks, Volume 33  CD | 
   
   
      | 1977 | 
       5/07 | May 1977: Get Shown the Light  CD | 
   
   
      | 1977 | 
       5/09 | May 1977: Get Shown the Light  CD | 
   
   
      | 1977 | 
       5/12 | May 1977  CD | 
   
   
      | 1977 | 
       5/13 | May 1977  CD | 
   
   
      | 1977 | 
       5/21 | Dick's Picks, Volume 29  CD | 
   
   
      | 1977 | 
       5/25 | Dave's Picks Volume  1  CD | 
   
   
      | 1977 | 
       6/09 | Winterland June 1977: The Complete Recordings  CD | 
   
   
      | 1977 | 
      11/04 | Dave's Picks Volume 12  CD | 
   
   
      | 1978 | 
       1/22 | Dave's Picks Volume 23  CD | 
   
   
      | 1978 | 
       4/24 | Dave's Picks Volume  7  CD | 
   
   
      | 1978 | 
       5/10 | Dick's Picks, Volume 25  CD | 
   
   
      | 1978 | 
       5/14 | 30 Trips Around the Sun  CD | 
   
   
      | 1978 | 
       7/03 | July 1978: The Complete Recordings  CD | 
   
   
      | 1978 | 
       7/07 | July 1978: The Complete Recordings  CD | 
   
   
      | 1979 | 
      11/05 | Road Trips Full Show: Spectrum 11/5/79  CD | 
   
   
      | 1980 | 
       5/07 | Road Trips Vol. 3 No. 4  CD | 
   
   
      | 1980 | 
      10/09 | The Warfield, San Francisco, California, October 9 & 10, 1980  CD | 
   
   
      | 1980 | 
      10/14 | Reckoning  LP | 
   
   
      | 1980 | 
      10/14 | The Arista Years  CD | 
   
   
      | 1980 | 
      10/14 | Beyond Description (1973 - 1989)  CD | 
   
   
      | 1980 | 
      10/23 | Reckoning  LP Bonus Track | 
   
   
      | 1980 | 
      10/23 | Beyond Description (1973 - 1989)  CD Bonus Track | 
   
   
      | 1980 | 
      11/30 | Dave's Picks Volume  8  CD | 
   
   
      | 1981 | 
       5/06 | Dick's Picks, Volume 13  CD | 
   
   
      | 1981 | 
       5/07 | The Tomorrow Show  TV Appearance | 
   
   
      | 1981 | 
      12/09 | Dave's Picks Volume 20  CD | 
   
   
      | 1983 | 
      10/21 | 30 Trips Around the Sun  CD | 
   
   
      | 1985 | 
      11/10 | So Many Roads (1965 - 1995)  CD | 
   
   
      | 1987 | 
       7/24 | View from the Vault IV Soundtrack  CD | 
   
   
      | 1987 | 
       7/24 | View from the Vault IV  Video | 
   
   
      | 1989 | 
       7/12 | Robert F. Kennedy Stadium, Washington, D.C., July 12 & 13, 1989  CD | 
   
   
      | 1989 | 
      10/19 | Without a Net  CD | 
   
   
      | 1990 | 
       3/15 | Terrapin Limited  CD | 
   
   
      | 1990 | 
       3/28 | Spring 1990 (The Other One)  CD | 
   
   
      | 1990 | 
       6/16 | View from the Vault III  Video | 
   
   
      | 1990 | 
       6/16 | View from the Vault III Soundtrack  CD | 
   
   
      | 1990 | 
       6/16 | View from the Vault Collection  Video Box Set | 
   
   
      | 1990 | 
       9/16 | Dick's Picks, Volume  9  CD | 
   
   
      | 1990 | 
      9/~ | Deadicated  CD by Various Artists | 
   
   
      | 1991 | 
       6/17 | Saint of Circumstance  CD | 
   
   
      | 1991 | 
       6/17 | Giants Stadium 1987, 1989, 1991  CD | 
   
   
      | 1991 | 
       9/10 | 30 Trips Around the Sun  CD | 
   
   
      | 1993 | 
       3/27 | 30 Trips Around the Sun  CD | 
   
   
      | 1993 | 
       5/27 | Road Trips Vol. 2 No. 4  CD Bonus Track | 
   
   
      | 1993 | 
       5/27 | Road Trips Vol. 2 No. 4  CD Bonus Track | 
   
   
      | 1995 | 
       9/~ | Fire on the Mountain: Reggae Celebrates the Grateful Dead  CD by Various Artists | 
   
   
      | 1997 | 
       4/15~ | Furthur More  CD by Various Artists | 
   
   
      | 1999 | 
      10/~ | Pickin' on the Grateful Dead Vol. 2  CD by Various Artists | 
   
   
      | 1999 | 
      10/~ | Long Strange Trip: Swingin' and Pickin' on the Grateful Dead  CD by Various Artists | 
   
   
      | 2002 | 
       | Gratefully Yours  CD by Jim Hudak |