Both WR and CR platforms are connected at Dadar via FOB.
Both have separate numbering starting from 1.
Very few express trains stop at Dadar WR, mostly at platform 5. Those starting from Dadar WR start from Platform 6/7 which are furthur to the north of the main station.
In Dadar CR, trains leaving from Mumbai mostly come at platform 4 and 5...
more... while those coming to Mumbai come at Platform 6. Trains starting from Dadar Terminus are on platform 7 and 8.