Up and coming towns in Philadelphia

Hello,

I am looking for suggestions on the neighborhoods in Philadelphia that are currently gentrifying, may not be the best places today but in sometime will have some appreciation.

I think I am late in the game for Kensington, Port Richmond areas ... But may be Grays Ferry, Point Breeze or University City are still doable.

I am ok with finding properties that need rehab and then can be rented out for cash flow.

Also any thoughts on the Darby neighborhoods outside of Philly along the train line?

Thank you all

Kunal M.