CREATE TABLE table_24572 ("Train No." TEXT, "Train Name" TEXT, "Destination" TEXT, "Category" TEXT, "Frequency" TEXT)

What trains have a category of express and a weekly frequency?
SELECT "Train Name" FROM table_24572 WHERE "Category" = 'Express' AND "Frequency" = 'Weekly'
SELECT "Train Name" FROM "table_24572" WHERE "Category" = 'Express' AND "Frequency" = 'Weekly'