CREATE TABLE table_23477312_1 (service VARCHAR2, train_name VARCHAR2, departure VARCHAR2)

What's the service number of the Pune Duronto train that departures at 21:35?
SELECT service FROM table_23477312_1 WHERE train_name = "Pune Duronto" AND departure = "21:35"
SELECT "service" FROM "table_23477312_1" WHERE "21:35" = "departure" AND "Pune Duronto" = "train_name"