UBL is not congested. It just that freights crossing that creates that impression. Once bypass is ready, it will solve that. Also to originate more trains from DWR it needs pitlines, which they wont build. UBL has 3 which is already underutilised with so less trains. And the crowd really fills any train at UBL only.
DWR -The existing island PF for the mainline 2-3 is really good. So maximum they can improve PF 1, 4 a bit, few escalators and main entrance building some improvement.
It is UBL which...
more... needs to start a few trains using the existing pitlines and PFs, which are good enough for now. Also at UBL they park the terminating/originating trains hours together at PFs, so again the idea of congestion arises.