user: Question: How many trains are there for the route via Trivandrum, Ernakulam, NewDelhi?
Columns: ['Train number', 'Train name', 'Origin', 'Destination', 'Service', 'Route/Via.']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [16724.0, 'Ananthapuri Express', 'Trivandrum', 'Chennai', 'Daily', 'Nagercoil,Madurai,Tiruchi']
SQL:

assistant: SELECT COUNT("Train number") FROM "Table" WHERE "Route/Via." = 'Trivandrum, Ernakulam, NewDelhi';