Exhibit 99.1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1)(iii) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a Statement on Schedule 13D (including additional amendments thereto) with respect to the shares of Common Stock, par value $0.01 per share, of L.B. Foster Company, a Pennsylvania corporation. This Joint Filing Agreement shall be filed as an Exhibit to such Statement.

22NW Fund, LP

By:	/s/ Aron R. English
	Aron R. English, Manager of 22NW Fund GP, LLC, its General Partner
Date:	12/12/2025

22NW, LP

By:	/s/ Aron R. English
	Aron R. English, President and Sole Shareholder of 22NW GP, Inc., its General Partner
Date:	12/12/2025

22NW Fund GP, LLC

By:	/s/ Aron R. English
	Aron R. English, Manager
Date:	12/12/2025

22NW GP, Inc.

By:	/s/ Aron R. English
	Aron R. English, President and Sole Shareholder
Date:	12/12/2025

English Aron R.

By:	/s/ Aron R. English
	ARON R. ENGLISH
Date:	12/12/2025

Hirai-Hadley Bryson

By:	/s/ Bryson O. Hirai-Hadley
	BRYSON O. HIRAI-HADLEY
Date:	12/12/2025

FOSTER L B CO SCHEDULE 13D/A