A Shramik Special train carryingnearly 1,200 migrants left for Darbhanga in Bihar on Tuesday night from Kalyan junction in neighbouring Thane district of Maharashtra, the Central Railway said.The end-to-end service departed at 8.37 pm carrying only the registered and nominated passengers cleared by the state government, a release said.On Monday, the Central Railway had operated two Shramik special trains between Akola-Lucknow and Bhiwandi- Jaipur.