Pony Up!

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Across
  1. 2. Shiny impteus
  2. 5. Cow boys best friend
  3. 8. Handoff movement
  4. 9. La Bolsa
  5. 10. Reduced West to East delivery by - (days)
  6. 11. Technological wonder which replaced the Express
  7. 13. Hollywood leading man seen in 1953's "Pony Express"
  8. 14. Allegedly a sought after courier trait
  9. 16. Swear an oath over it
  10. 18. Then - Speedy Horse, Now - Speedy Car
  11. 19. Accompanied the first delivery - Sincerely, Buchanan
  12. 20. "Riders in the Night" 1983
Down
  1. 1. Departure Definer
  2. 3. Referenced Riders in memoir "Roughing It"
  3. 4. Supposed shortcut with an infamous past
  4. 6. Finish Line!
  5. 7. Home is where the fort is
  6. 12. Starting Line!
  7. 15. Native Mail Disruptors
  8. 17. Wild West folk hero named after his hunting of totemic fauna