Task: Classify the mental state of the tweeter based on the tweet, determining if it is 'neutral or no emotion' or characterized by any of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: @Virgin_TrainsEC I feel for the conductor tonight, he's obviously taken grief over the last few weeks, he sounds weary of apologising!
This tweet contains emotions: 
sadness