CREATE TABLE table_204_336 (id DECIMAL, "operators" TEXT, "named trains" TEXT, "destination" TEXT, "year begun" TEXT, "year discontinued" DECIMAL)

how many trains were discontinued in 1958 ?
SELECT COUNT("named trains") FROM table_204_336 WHERE "year discontinued" = 1958
SELECT COUNT("named trains") FROM "table_204_336" WHERE "year discontinued" = 1958