Task: Determine the prevailing emotional tone of the tweet, categorizing it as either 'neutral or no emotion' or as one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that most accurately represent the tweeter's mental state.
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