 Trade union disputes coupled with a poor relationship between the concessionaire and the municipality were the triggers for the termination of the concession in October 2004.On the 25th of that month, line K passed back into municipal control through Sociedad del Estado Municipal para el Transporte Urbano de Rosario (SEMTUR).By June 2005, about half of the fleet of 20 trolleybuses had been repainted in SEMTUR's grey and orange colors.