MUMBAI, Jan. 25 -- Two days after three of their colleagues were killed by a train while on duty, unions and employees of the Western Railway (WR) signalling department, after holding a condolence meet, had discussions on what could be done to improve the safety of their staff. Sources said there were two main issues that needed to be addressed: one, stopping the practice of attending to 'unregistered complaints' and two, filling up vacancies, which have reached over 40%....