Exhibit 99.1

FOR RELEASE: IMMEDIATE

GATX CORPORATION REPORTS 2011 FOURTH QUARTER AND FULL-YEAR RESULTS

CHICAGO, IL, January 19, 2012 – GATX Corporation (NYSE:GMT) today reported 2011 fourth quarter net income of $31.6 million or $.67 per diluted share, compared to net income of $19.5 million or $.42 per diluted share in the fourth quarter of 2010. The 2011 and 2010 fourth quarter results include the positive aggregate impact from Tax Benefits and Other Items of $1.9 million or $.05 per diluted share and $4.5 million or $.09 per diluted share, respectively.

Net income for the full-year 2011 was $110.8 million or $2.35 per diluted share, compared to net income of $80.8 million or $1.72 per diluted share in the prior year. The 2011 and 2010 results include the positive aggregate impact from Tax Benefits and Other Items of $15.8 million or $.34 per diluted share and $6.2 million or $.13 per diluted share, respectively. Details related to the Tax Benefits and Other Items are provided in the attached Supplemental Information.

Brian A. Kenney, president and chief executive officer of GATX, said, “The North American rail market recovered more quickly than we anticipated in 2011. Due to broad-based improvement in the demand for railcars, we successfully raised lease rates while maintaining high utilization throughout the year. The Lease Price Index (“LPI”) for the fourth quarter was a positive 13.2% and utilization was strong, ending the year at 98.2%.

“The favorable operating environment provided the foundation for GATX to achieve key objectives outlined at the beginning of the year. First, we increased lease rates as indicated by the LPI results. Second, we executed on our plan to sell targeted assets in an improving market, generating nearly $45 million of asset remarketing income. Finally, we took advantage of opportunities to grow the asset base. We placed the largest railcar order in GATX’s history, putting us in a unique position to serve our customers and further strengthen our competitive position. In 2011, we invested $615 million, primarily to expand our North American and European rail platforms.”

Mr. Kenney continued, “Looking to the year ahead, we expect continued improvement in Rail’s operating results in North America and Europe. We expect American Steamship Company (“ASC”) to experience modestly higher demand as their tonnage is heavily dependent on the performance of the North American auto industry. The ocean-going marine joint ventures will likely have mixed results, as the chemical and bulker markets remain soft while the gas carrier market is experiencing some recent improvement. Across GATX, asset remarketing opportunities will continue to be available, particularly if the capital markets remain favorable. Based on these factors, we expect full-year 2012 EPS to be in the range of $2.40 to $2.60 per diluted share.”

“In 2012, we will build on the strategy executed during the recent downturn, when we added thousands of cars to our fleet at advantaged prices and kept lease terms short in anticipation of this recovery. We plan to increase profitability by raising lease rates on the 20,000 railcars that are scheduled for renewal in North America. We will selectively extend lease terms, and we will place our new railcar deliveries at attractive rates with our best customers. Although growth beyond our committed railcar order could prove challenging due to rising asset prices, we will look for opportunities to invest prudently with our best customers and in emerging rail markets. We will also continue our focus on maximizing operational efficiencies by controlling SG&A expenses, railcar maintenance expenses, and operating costs at ASC.”

Mr. Kenney concluded, “By maintaining focus on the items outlined above, we expect to drive higher returns for our shareholders.”

RAIL

Rail segment profit was $62.1 million in the fourth quarter of 2011, compared to $39.2 million in the fourth quarter of 2010. The 2011 and 2010 fourth quarter results include the negative aggregate impact from Other Items of $2.0 million and $1.5 million, respectively. The improvement in segment profit was reflective of the strong operating environment in 2011 as evidenced by lease rate, utilization and remarketing results.

Rail reported segment profit of $233.4 million in 2011, compared to $150.6 million in 2010. The 2011 and 2010 results include the aggregate impact from Other Items of positive $9.0 million and negative $10.4 million, respectively. The increase in segment profit was driven by the items noted above.

At December 31, 2011, Rail’s wholly-owned North American fleet totaled approximately 109,000 cars. Fleet utilization was 98.2%, consistent with the third quarter and up from 97.4% at 2010 year end. The European wholly-owned tank car fleet totaled approximately 21,000 cars and utilization was 97.1%, up from 96.0% at the end of the third quarter and 95.7% at 2010 year end.

During the fourth quarter of 2011 in North America, lease renewal pricing on cars in the Lease Price Index (“LPI”) increased 13.2% versus expiring lease rates, compared to a 9.6% increase in the prior quarter and a 14.0% decrease in the fourth quarter 2010. The average lease term on LPI renewals during the fourth quarter was 48 months, down slightly from 49 months in the third quarter and up from 36 months in the fourth quarter of 2010. For the full-year 2011, lease renewal rates on cars in the LPI increased 6.9% versus expiring rates with an average renewal term of 45 months. This compares with an average renewal rate decrease of 15.8% and average renewal term of 35 months in 2010. Investment volume in 2011 at Rail in North America and Europe totaled $421 million, compared to $475 million in 2010.

Page 2

Additional current and historical fleet and operating data as well as macroeconomic data related to Rail’s business can be found on the last page of this press release.

PORTFOLIO MANAGEMENT

Effective with this earnings release, the former “Specialty” segment will be called “Portfolio Management” to better reflect the strategic initiatives of this segment.

Portfolio Management reported segment profit of $16.6 million in the fourth quarter of 2011 compared to $8.5 million in the prior year period. Increased asset remarketing activity of wholly-owned assets and within the joint ventures drove the segment profit for the fourth quarter of 2011 versus the fourth quarter of 2010. For full-year 2011, Portfolio Management reported segment profit of $47.6 million, comparable to $48.7 million in 2010.

The Portfolio Management segment currently consists of approximately $846.6 million of owned assets (including on and off balance sheet assets) and third-party managed portfolios totaling approximately $166.7 million.

AMERICAN STEAMSHIP COMPANY

American Steamship Company (“ASC”) reported segment profit of $9.4 million in the fourth quarter 2011 compared to $6.6 million in the fourth quarter 2010. The improvement in segment profit was driven by increased tonnage and higher rates. Segment profit for 2011 was $27.3 million compared to $28.6 million in 2010. ASC operated 14 of its 17 vessels during the sailing season and transported 28.4 million net tons of cargo compared to 28.0 million net tons carried in the prior year. Subsequent to year end, ASC reached an agreement with the American Maritime Officer’s union (“AMO”) on a new five-year labor contract. ASC and the AMO worked collaboratively on the contract, which will enable ASC to meet customer needs in a cost-competitive manner.

COMPANY DESCRIPTION

GATX Corporation (NYSE:GMT) provides leasing and related services to customers operating rail, marine and other targeted assets. GATX is a leader in leasing transportation assets and controls one of the largest railcar fleets in the world. Applying over a century of operating experience and strong market and asset expertise, GATX provides quality assets and services to customers worldwide. GATX has been headquartered in Chicago, Illinois since its founding in 1898 and has traded on the New York Stock Exchange since 1916. For more information, visit the Company’s website at www.gatx.com.

Page 3

TELECONFERENCE INFORMATION

GATX Corporation will host a teleconference to discuss 2011 fourth quarter and full-year results. Teleconference details are as follows:

Thursday, January 19^th

11:00 A.M. Eastern Time

Domestic Dial-In: 1-877-638-9067

International Dial-In: 1-647-438-1131

Replay: 1-888-203-1112 or 1-719-457-0820 /Access Code: 6261514

Call-in details, a copy of this press release and real-time audio access are available at www.gatx.com. Please access the call 15 minutes prior to the start time. Following the call, a replay will be available on the same site.

FORWARD-LOOKING STATEMENTS

This document contains statements that may constitute forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934 and are subject to the safe harbor provisions of those sections and the Private Securities Litigation Reform Act of 1995. Some of these statements may be identified by words such as “anticipate,” “believe,” “estimate,” “expect,” “intend,” “predict,” “project” or other words and terms of similar meaning. Investors are cautioned that any such forward-looking statements are not guarantees of future performance and involve risks and uncertainties, including those described in GATX’s Annual Report on Form 10-K for the year ended December 31, 2010 and other filings with the SEC, and that actual results or developments may differ materially from those in the forward-looking statements. Specific factors that might cause actual results to differ from expectations include, but are not limited to, general economic, market, regulatory and political conditions in the rail, marine, industrial and other industries served by GATX and its customers; lease rates, utilization levels and operating costs in GATX’s primary operating segments; conditions in the capital markets; changes in GATX’s credit ratings and financing costs; regulatory rulings that may impact the economic value and operating costs of assets; costs associated with maintenance initiatives; competitive factors in GATX’s primary markets, including lease pricing and asset availability; operational and financial risks associated with long-term railcar purchase commitments; changes in loss provision levels within GATX’s portfolio; impaired asset charges that may result from changing market conditions or portfolio management decisions implemented by GATX; the opportunity for remarketing income; uncertainties in relations with labor unions representing GATX employees; and the outcome of pending or threatened litigation. Given these risks and uncertainties, readers are cautioned not to place undue reliance on these forward-looking statements, which reflect management’s analysis, judgment, belief or expectation only as of the date hereof. GATX has based these forward-looking statements on information currently available and disclaims any intention or obligation to update or revise these forward-looking statements to reflect subsequent events or circumstances.

FOR FURTHER INFORMATION CONTACT:

GATX Corporation

Jennifer Van Aken

312-621-6689

jennifer.vanaken@gatx.com

Investor, corporate, financial, historical financial, photographic and news release information may be found at www.gatx.com.

(1/19/12)

—Tabular Follows—

Page 4

GATX CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)

(In Millions, Except Per Share Data)

Page 5

GATX CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)

(In Millions, Except Per Share Data)

(Continued)

Page 6

GATX CORPORATION AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS (UNAUDITED)

(In Millions)

Page 7

GATX CORPORATION AND SUBSIDIARIES

SEGMENT DATA (UNAUDITED)

Three Months Ended December 31, 2011

(In Millions)

Page 8

GATX CORPORATION AND SUBSIDIARIES

SEGMENT DATA (UNAUDITED)

Twelve Months Ended December 31, 2011

(In Millions)

Page 9

GATX CORPORATION AND SUBSIDIARIES

SEGMENT DATA (UNAUDITED)

Three Months Ended December 31, 2010

(In Millions)

Page 10

GATX CORPORATION AND SUBSIDIARIES

SEGMENT DATA (UNAUDITED)

Twelve Months Ended December 31, 2010

(In Millions)