Pacer International (PACR) 10-Q 2008 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 Pacer International, Inc. (the “Company”) on Form 10-Q for the fiscal quarter ended September 19, 2008, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), we, Michael E. Uremovich, Chief Executive Officer of the Company, and Brian C. Kane, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 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, as amended; and

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

/s/ M.E. Uremovich

M.E. Uremovich

Chief Executive Officer

October 29, 2008

/s/ B.C. Kane

B.C. Kane

Chief Financial Officer

October 29, 2008

A signed original of this written statement required by Section 906 has been provided to Pacer International, Inc. and will be retained by Pacer International, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.