our access to commercial paper and reduce our credit ratings below investment grade , which would prohibit us from utilizing our sale of receivables program and significantly increase the cost of issuing debt .we are dependent on two key domestic suppliers of locomotives 2013 due to the capital intensive nature and sophistication of locomotive equipment , high barriers to entry face potential new suppliers .therefore , if one of these domestic suppliers discontinues manufacturing locomotives , we could experience a significant cost increase and risk reduced availability of the locomotives that are necessary to our operations .we may be affected by acts of terrorism , war , or risk of war 2013 our rail lines , facilities , and equipment , including rail cars carrying hazardous materials , could be direct targets or indirect casualties of terrorist attacks .terrorist attacks , or other similar events , any government response thereto , and war or risk of war may adversely affect our results of operations , financial condition , and liquidity .in addition , insurance premiums for some or all of our current coverages could increase dramatically , or certain coverages may not be available to us in the future .item 1b .unresolved staff comments item 2 .properties with operations in 23 states , we employ a variety of assets in the management and operation of our rail business .these assets include real estate , track and track structure , equipment , and facilities .we own and lease real estate that we use in our operations , and we also own real estate that is not required for our business , which we sell from time to time .our equipment includes owned and leased locomotives and rail cars ; heavy maintenance equipment and machinery ; other equipment and tools in our shops , offices and facilities ; and vehicles for maintenance , transportation of crews , and other activities .we operate numerous facilities , including terminals for intermodal and other freight ; rail yards for train-building , switching , storage-in-transit ( the temporary storage of customer goods in rail cars prior to shipment ) and other activities ; offices to administer and manage our operations ; dispatch centers to direct traffic on our rail network ; crew quarters to house train crews along our network ; and shops and other facilities for fueling , maintenance , and repair of locomotives and repair and maintenance of rail cars and other equipment .we spent approximately $ 2.2 billion in cash capital during 2006 for , among other things , building and maintaining track , structures and infrastructure ; upgrading and augmenting equipment ; and implementing new technologies ( see the capital investments table in management 2019s discussion and analysis of financial condition and results of operations 2013 liquidity and capital resources 2013 financial condition , item 7 ) .certain of our properties are subject to federal , state , and local laws and regulations governing the protection of the environment ( see discussion of environmental issues in business 2013 governmental and environmental regulation , item 1 , and management 2019s discussion and analysis of financial condition and results of operations 2013 critical accounting policies 2013 environmental , item 7 ) .track 2013 the railroad operates on 32339 main line and branch line route miles in 23 states in the western two-thirds of the united states .we own 26466 route miles , with the remainder of route miles operated pursuant to trackage rights or leases .route miles as of december 31 , 2006 and 2005 , were as follows : 2006 2005 .
[['', '2006', '2005'], ['main line', '27318', '27301'], ['branch line', '5021', '5125'], ['yards sidings and other lines', '19257', '20241'], ['total', '51596', '52667']]
.

Question: what percent of total route miles are main line in 2005?
Answer: 52%