RIDING THE RAIL Late-night rail service's fate riding on Metro evaluation Low ridership could spell end to 'last call' trains By LUCAS WALL Copyright 2004 Houston Chronicle Late-night bar patrons downtown might be running out of time to use the train as their designated driver. Metro is reviewing whether to continue late rail service on Friday and Saturday nights. The extended weekend hours began in June at the request of city officials and downtown businesses who hoped the availability of the rail ride might lure more customers. It hasn't happened. "Ridership has been disappointing, but Metro leadership is now working...