SELECT COUNT("Train number") FROM table_4239 WHERE "Route/Via." = 'Trivandrum, Ernakulam, NewDelhi'
How many trains are there for the route via trivandrum, ernakulam, newdelhi?
CREATE TABLE table_4239 (
    "Train number" real,
    "Train name" text,
    "Origin" text,
    "Destination" text,
    "Service" text,
    "Route/Via." text
)