* Posts Q4 loss of $4.14 a share

* Hopeful of debt deal with lenders by mid-February

* Says cost improvements of $500 mln going into 2010

* Shares up 10 percent after hours (Adds company comments on asset sales, cost improvements, background on company's problems)

CHICAGO, Jan 29 (Reuters) - Struggling No. 1 U.S. trucking company YRC Worldwide Inc (YRCW.O) on Thursday reported a fourth-quarter net loss, citing the impact of the slowing U.S. economy and impairment charges.

UPDATE 2-YRC posts loss, says hopeful of debt deal mid-Feb | Markets | Markets News | Reuters