Answer: ponyexpress
AnswerCrossword Clue
PONYEXPRESSPostal route of 1860.
PONYEXPRESSDelivery service of yore
PONYEXPRESS19th-century mail transport
PONYEXPRESS19th-century mail delivery service
PONYEXPRESSSaddlebags of mail
PONYEXPRESSEarly mail system
PONYEXPRESSEnterprise for which a 14-year-old Buffalo Bill worked
PONYEXPRESSMail service made obsolete by the transcontinental telegraph
PONYEXPRESSIt delivered in the Old West
PONYEXPRESSThey were seldom left at post
PONYEXPRESSAncestor of airmail.
PONYEXPRESSEarly US carrier
PONYEXPRESSForerunner of the Iron Horse.
PONYEXPRESSLegendary mail service
PONYEXPRESS1860s mail service
PONYEXPRESSShort-lived mail system
PONYEXPRESS19th-century mail system
PONYEXPRESSOld West conveyance
PONYEXPRESSDelivery service of old
PONYEXPRESSOld Missouri-to-California mail system
PONYEXPRESSOld mail system
PONYEXPRESSHorseback post