The Railway Engineering-Maintenance Suppliers Association (REMSA) is a non-profit membership-based organization located in Washington, D.C.

The Railway Engineering-Maintenance Suppliers Association represents companies and individuals who manufacture or sell maintenance-of-way equipment, products, and services, or are engineers, contractors and consultants working in construction and/or maintenance of railroad transportation facilities.

REMSA was created in 1965 by the merger of the Association of Track and Structure Suppliers and the National Railway Appliances Association, two long-standing organizations in the railroad maintenance-of-way industry.

REMSA members constitute a large part of the maintenance-of-way industry.