pre_text: item 1b . unresolved staff comments item 2 . properties we employ a variety of assets in the management and operation of our rail business . our rail network covers 23 states in the western two-thirds of the u.s . our rail network includes 31974 route miles . we own 26012 miles and operate on the remainder pursuant to trackage rights or leases . the following table describes track miles at december 31 , 2014 and 2013 . 2014 2013 .
post_text: headquarters building we own our headquarters building in omaha , nebraska . the facility has 1.2 million square feet of space for approximately 4000 employees. .
table: <i>2014</i> <i>2013</i>
table: Route 31,974 31,838
table: Other main line 6,943 6,766
table: Passing lines and turnouts 3,197 3,167
table: Switching and classification yard lines 9,058 9,090
table: Total miles 51,172 50,861
question: Analyse this data from a financial earnings document. what percentage of total miles were other main line in 2013?