Public transportation musical fits Boston to a T
Late trains, missed stops, broken air conditioning. . . . Few Bostonians would mistake the MBTA for the yellow brick road these days. But three harried 20-somethings find an old T map that leads them on a “Wizard of Oz’’-style voyage of self-discovery in “T: An MBTA Musical,’’ a scripted show opening Thursday at ImprovBoston in Cambridge.