Exhibit 32.1

Certification Pursuant to Rule 13a-14 (b) of the Securities Exchange Act of 1934 and

Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. Section 1350 (a) and (b))

I, John O'Bryan, President and Chief Executive Officer of American Railcar Industries, Inc. (the “Company”) certify, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 that, to my knowledge:


1.	the quarterly report on Form 10-Q of the Company for the three months ended June 30, 2018 (the “Quarterly 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 Quarterly Report fairly presents, in all material respects, the financial condition and results of operations of the Company.



Date:	August 1, 2018	/s/ John O'Bryan
		John O'Bryan, President and Chief Executive Officer

I, Luke M. Williams, Senior Vice President, Chief Financial Officer, and Treasurer of American Railcar Industries, Inc. (the “Company”), certify, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 that, to my knowledge:


1.	the quarterly report on Form 10-Q of the Company for the three months ended June 30, 2018 (the “Quarterly 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 Quarterly Report fairly presents, in all material respects, the financial condition and results of operations of the Company.



Date:	August 1, 2018	/s/ Luke M. Williams
		Luke M. Williams, Senior Vice President, Chief Financial Officer and Treasurer

A signed original of these written statements required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

American Railcar Industries, Inc. 10-Q