PARIS: A computer glitch in a railway signalling system caused train traffic disruptions in Poland, Italy and Asia, French rail giant Alstom said on Thursday. The problem has been detected and is in the process of being fixed, a spokesman for the company said, adding that it was not a cyberattack. The malfunctions have caused significant delays and cancellations along train routes, railway authorities in Poland and Italy said.In Italy, railway company TRENITALIA issued an alert saying that contr