CREATE TABLE table_26099 ("Service" FLOAT, "Train number" FLOAT, "Train name" TEXT, "Source" TEXT, "Departure" TEXT, "Destination" TEXT, "Arrival" TEXT)

What's the service number of the Jammu Duronto train?
SELECT MAX("Service") FROM table_26099 WHERE "Train name" = 'Jammu Duronto'
SELECT MAX("Service") FROM "table_26099" WHERE "Train name" = 'Jammu Duronto'