Please answer the given financial question based on the context.
Context: 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 .
||2013|2012|
|route|31838|31868|
|other main line|6766|6715|
|passing lines and turnouts|3167|3124|
|switching and classification yard lines|9090|9046|
|total miles|50861|50753|
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 .
Question: what percentage of total miles of track were switching and classification yard lines in 2013?
Answer:
0.17872