Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the Registration Statement (Form S-8) pertaining to the Chemtec Energy Services 401(k) Plan of our reports dated March 3, 2015, with respect to the consolidated financial statements and schedule of L.B. Foster Company and the effectiveness of internal control over financial reporting of L.B. Foster Company, included in its Annual Report (Form 10-K) for the year ended December 31, 2014, filed with the Securities and Exchange Commission.

/s/ Ernst & Young LLP

Pittsburgh, Pennsylvania

December 31, 2015