NEW YORK — A radio glitch kept an MTA worker from alerting colleagues that their disabled subway train was about to smash into a passenger-carrying train beneath the Upper West Side, says a preliminary federal report on the Jan. 4 collision. The just-the-facts account from the National Transportation Safety Board does not confirm the cause of the crash at the No. 1/2/3 station at W. 96th St. and Broadway in Manhattan, which resulted in minor injuries to 22 passengers and three MTA employees. But the NTSB report is in line with media accounts — including in the Daily News — that faulty radio co…