International Association of Machinists and Aerospace Workers
International Brotherhood of Boilermakers, Iron Ship Builders, Blacksmiths, Forgers & Helpers, AFL-CIO
Sheet Metal Workers’ International Association
Brotherhood of Maintenance of Way Employees
National Conference of Firemen & Oilers
Transportation Communications International Union
International Brotherhood of Electrical Workers
Brotherhood of Railway Signalmen
Brotherhood of Locomotive Engineers
United Transportation Union
