ye track Y leg ke problem ko thik karne ke liye bichaya ja raha hai, yahi pe problem hai jiske karan train speed me nahi jata hai, yaha par sharp track change hai jiske karan y leg ke approval me dikkat aa raha tha, order mila hai ki tunnel ke kaam ke pahle isko thik kiya jana hai taki train ka load munger bridge pe dala ja sake. isliye Yleg a length badhaya ja raha hai, tunnel ke approach track ka kaam doosri taraf chal raha hai