what percentage of total miles of track were switching and classification yard lines in 2013?
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 31838 route miles . we own 26009 miles and operate on the remainder pursuant to trackage rights or leases . the following table describes track miles at december 31 , 2013 and 2012 . 2013 2012 .

|  | <i>2013</i> | <i>2012</i> |
| :--- | :--- | :--- |
| Route | 31,838 | 31,868 |
| Other main line | 6,766 | 6,715 |
| Passing lines and turnouts | 3,167 | 3,124 |
| Switching and classification yard lines | 9,090 | 9,046 |
| Total miles | 50,861 | 50,753 |

headquarters building we maintain our headquarters in omaha , nebraska . the facility has 1.2 million square feet of space for approximately 4000 employees and is subject to a financing arrangement . harriman dispatching center the harriman dispatching center ( hdc ) , located in omaha , nebraska , is our primary dispatching facility . it is linked to regional dispatching and locomotive management facilities at various locations along our .

track_miles_switched = 9090
total_miles = 50861
percent_switched = track_miles_switched / total_miles
answer = percent_switched * 100