As February begins to wind down, the hits are coming few and far between. This week is bookended with one hit, one miss. The big hit is Tony Scott's visually and viscerally exciting 'Unstoppable,' a straight-ahead action thriller about a runaway train starring Denzel Washington and Chris Pine. At the other extreme is the latest entry in the Woody Allen ouvre, 'You Will Meet a Talk dark Stranger,' a muddled romantic comedy about a pair of married couples who cast their fate to the wind and seek greener pastures when life hands them roadblocks and disappointments. Read on.