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 32084 route miles . we own 26064 miles and operate on the remainder pursuant to trackage rights or leases . the following table describes track miles at december 31 , 2015 and 2014. .
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: 2015 2014
table: Route 32,084 31,974
table: Other main line 7,012 6,943
table: Passing lines and turnouts 3,235 3,197
table: Switching and classification yard lines 9,108 9,058
table: Total miles 51,439 51,172
question: Analyse this data from a financial earnings document. what percentage of total miles were other main line in 2015?