The approach to BSW terminus on metro is few feet below the street level. If they extend it to BHM, they would have to tunnel it to the street level or they would have build a very steep slope to street level. I don't know how this can be done.
Unless they're planning to do this at completely different platform, this seems like it can not be done.
Unless they're planning to do this at completely different platform, this seems like it can not be done.