From the Forest Hill Society response to the RUS:

"We propose that at least 2 tph on the Thameslink service stop at New Cross Gate after the introduction of the East London Line.

Passengers from the East London Line would then be able to change to these services to London Bridge, Kings Cross, Bedford , Gatwick and Brighton. This would reduce overcrowding on the remaining services from New Cross Gate to London Bridge by adding additional capacity, provide faster travel from Gatwick to Canary Wharf and City Airport, reduce passenger overcrowding at London Bridge station with customers changing platforms (this is recognised as a problem area in the RUS), and it would reduce overcrowding on the Northern Line for a significant number of passengers from South London wishing to continue beyond Kings Cross."