The Greenbrier Companies, Inc. (GBX) 10-K 2015 FY Annual report

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the annual report of The Greenbrier Companies, Inc. (the Company) on Form 10-K for the annual period ended August 31, 2015 as filed with the Securities and Exchange Commission on the date therein specified (the Report), I, Mark J. Rittenbaum, Executive Vice President and Chief Financial Officer of the Company, certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: October 30, 2015

/s/    Mark J. Rittenbaum

Mark J. Rittenbaum

Executive Vice President and Chief Financial Officer