ST. JOSEPH, Mo. (AP) — The Pony Express will be riding again for the next two weeks.

The 35th Annual Pony Express Reride will leave Monday from the site in St. Joseph where the mail-delivery service started 155 years ago. ThePony Express began in 1860, with each rider going about 80 miles before handing mail to the next rider.

About 550 people and horses will make the trip, with each riding about five miles over the route.

That compares to about 80 miles ridden by the original riders. The ride is scheduled to end June 25 in Old Sacramento, California. The first rider was scheduled to leave St Joseph at about 10am after a brief ceremony starting at 9:30am.

Riders from St. Joseph will hand packages to the Kansas Chapter of the National Pony Express Association in Elwood, Kansas. After that, riders will travel to Nebraska, Colorado, Wyoming, Utah and Nevada before arriving in California.

The National Pony Express Association is hosting the event.