X0303 5 2010-12-31 false 0 0 0000040211 GATX CORP GMT 0001020062 FRETZ DEBORAH M C/O GATX CORPORATION 222 W. ADAMS ST. CHICAGO IL 60606 true false false false Common Stock 34319.4967 D This amount reflects shares purchased through the dividend reinvestment plan, in the amount of .0566 shares, which is the revinvestment of dividends from the one commemorative gift share given by the company in honor of GATX Corporation's centennial. Lisa M. Ibarra, by Power of Attorney on behalf of Deborah M. Fretz 2011-01-25