EXHIBIT 11A GATX CORPORATION AND SUBSIDIARIES COMPUTATION OF BASIC NET (LOSS) INCOME PER SHARE OF COMMON STOCK (IN MILLIONS, EXCEPT PER SHARE AMOUNTS) THREE MONTHS ENDED NINE MONTHS ENDED SEPTEMBER 30 SEPTEMBER 30 ------------------- ------------------- 2001 2000 2001 2000 ------- ------- ------- ------- Average number of shares of common stock outstanding 48.6 47.5 48.5 47.9 (Loss) income from continuing operations $ (7.3) $ 37.6 $ 19.6 $ 107.6 Income from discontinued operations - 7.5 165.4 19.6 ------- ------- ------- ------- Net (loss) income (7.3) 45.1 185.0 127.2 Deduct - dividends paid and accrued on preferred stock - - - - ------- ------- ------- ------- Net (loss) income, as adjusted $ (7.3) $ 45.1 $ 185.0 $ 127.2 ======= ======= ======= ======= Basic net (loss) income per share: (Loss) income from continuing operations $ (.15) $ .79 $ .41 $ 2.24 Income from discontinued operations - .16 3.41 .41 ------- ------- ------- ------- Basic net (loss) income per share $ (.15) $ .95 $ 3.82 $ 2.65 ======= ======= ======= =======