Railway labour unions once again launched protest here due to non payment of their salaries on Thursday. According to the details, Lahore division and workshop labourers held protest demonstration as Federal Minister for Railways Ghulam Ahmed Bilour failed to fulfill his promise to release salaries of employees. Railway labourers staged a sit-in in front of trains parked at washing line. Railway employees said that the protest would continue until they got their salaries. Meanwhile, railway officials said that salaries would be released at all costs.