us in a position to handle demand changes . we will also continue utilizing industrial engineering techniques to improve productivity . 2022 fuel prices 2013 uncertainty about the economy makes fuel price projections difficult , and we could see volatile fuel prices during the year , as they are sensitive to global and u.s . domestic demand , refining capacity , geopolitical events , weather conditions and other factors . to reduce the impact of fuel price on earnings , we will continue to seek recovery from our customers through our fuel surcharge programs and to expand our fuel conservation efforts . 2022 capital plan 2013 in 2011 , we plan to make total capital investments of approximately $ 3.2 billion , including expenditures for positive train control ( ptc ) , which may be revised if business conditions warrant or if new laws or regulations affect our ability to generate sufficient returns on these investments . ( see further discussion in this item 7 under liquidity and capital resources 2013 capital plan. ) 2022 positive train control 2013 in response to a legislative mandate to implement ptc by the end of 2015 , we expect to spend approximately $ 250 million during 2011 on developing ptc . we currently estimate that ptc will cost us approximately $ 1.4 billion to implement by the end of 2015 , in accordance with rules issued by the federal railroad administration ( fra ) . this includes costs for installing the new system along our tracks , upgrading locomotives to work with the new system , and adding digital data communication equipment so all the parts of the system can communicate with each other . during 2011 , we plan to begin testing the technology to evaluate its effectiveness . 2022 financial expectations 2013 we remain cautious about economic conditions , but anticipate volume to increase from 2010 levels . in addition , we expect volume , price , and productivity gains to offset expected higher costs for fuel , labor inflation , depreciation , casualty costs , and property taxes to drive operating ratio improvement . results of operations operating revenues millions 2010 2009 2008 % (  % ) change 2010 v 2009 % (  % ) change 2009 v 2008 .
what is the percent change in freight revenue from 2008 to 2010?
freight revenues are revenues generated by transporting freight or other materials from our six commodity groups . freight revenues vary with volume ( carloads ) and average revenue per car ( arc ) . changes in price , traffic mix and fuel surcharges drive arc . we provide some of our customers with contractual incentives for meeting or exceeding specified cumulative volumes or shipping to and from specific locations , which we record as a reduction to freight revenues based on the actual or projected future shipments . we recognize freight revenues as freight moves from origin to destination . we allocate freight revenues between reporting periods based on the relative transit time in each reporting period and recognize expenses as we incur them . other revenues include revenues earned by our subsidiaries , revenues from our commuter rail operations , and accessorial revenues , which we earn when customers retain equipment owned or controlled by us or when we perform additional services such as switching or storage . we recognize other revenues as we perform services or meet contractual obligations . freight revenues and volume levels for all six commodity groups increased during 2010 as a result of economic improvement in many market sectors . we experienced particularly strong volume growth in automotive , intermodal , and industrial products shipments . core pricing gains and higher fuel surcharges also increased freight revenues and drove a 6% ( 6 % ) improvement in arc . freight revenues and volume levels for all six commodity groups decreased during 2009 , reflecting continued economic weakness . we experienced the largest volume declines in automotive and industrial .