Since there are crossovers at City Hall and Raffles Place from
EWL to NSL, I feel that SMRT should provide direct service form EWL
to NSL and vice versa. The service can be alternate, which
means,
"Your attention please, the oncoming train at platform A
will crossover to the North South Line to proceed towards Jurong
East via Woodlands after City Hall Interchange. Passengers
going beyond City Hall on the East West Line, please wait
for the next train at platform A.".
"Your attention please, the oncoming train at Platform B
will cross over to the East West Line and then proceed towards
Pasir Ris. Passengers going to Marina Bay, please wait
for the next train.".
This can help to ease congestion at interchange stations as well
as ease congestion on EWL trains after it picks up
passengers from NSL.