CREATE TABLE table_204_30 (id DECIMAL, "year built" TEXT, "works number" DECIMAL, "wheel arr." TEXT, "gauge" TEXT, "original owner" TEXT, "name" TEXT, "current location" TEXT, "notes" TEXT)

after 1940 , how many steam locomotives were built ?
SELECT COUNT(*) FROM table_204_30 WHERE "year built" > 1940
SELECT COUNT(*) FROM "table_204_30" WHERE "year built" > 1940