The Greenbrier Companies, Inc. (GBX) 10-Q 2021 Q3 Quarterly report

Exhibit 32.1

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 quarterly report of The Greenbrier Companies, Inc. (the "Company") on Form 10-Q for the quarterly period ended May 31, 2021, as filed with the Securities and Exchange Commission on the date therein specified (the "Report"), I, William A. Furman, Chief Executive 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:	July 9, 2021
	/s/ William A. Furman
	William A. Furman
	Chief Executive Officer