Jamalpur se bariarpur line already double except jamalpur ratanpur section 6 km long which is single due to single tunnel of very hard mountain between them. The tunnel 150 yes old and its original safe period expired 50 years earlier but still running. If the railway which is planning one new double line tunnel to make parallel to it, makes it, it will not take much time to double full jamalpur- ratanpur section. Let's see whether railways starts it in next year or not.