Dats true.only 5 kms won't matter much.but yes if it is doubled capacity will surely increase in this route.u have asn RNC ,asn bksc,puru,jalianwala bagh.also freight can also get a boost from bksc end to tata end avoiding ksx.so I feel it should be doubled.now let's see what rail thinks.changing tracks also takes time.with so many trains now being diverted through dankuni bhattanagar Abdul .this route surely will be doubled