The Katy Trail is a 237 mile trail stretching across most of the state of Missouri. The eastern half follows Lewis and Clark’s journey up the Missouri River. It is the longest “rails-to-trail” project, formerly the MKT rail line. The Missouri–Kansas–Texas Railroad or MKT was incorporated May 23, 1870. In its earliest days the MKT was commonly referred to as “the K-T”, which evolved into “the Katy”.