The increasing demand for freight rail service has prompted railroads such as BNSF, Canadian Pacific, CSX and Union Pacific to add more employees. The Class I's are expected to provide 15,000 jobs for train engineers, station workers and conductors, according to AAR spokeswoman Holly Arthur. CP said it brought back 1,500 laid-off workers and hired 1,650 new ones last year and will hire 1,750 more workers in 2011. BNSF hired nearly 100 new workers last year and has hired 226 workers so far this year. UP, which bolstered its workforce last year by 4,000, has plans to add 4,000 workers this year and 4,000 more in 2012.