CREATE TABLE table_204_77 (id DECIMAL, "number" TEXT, "builder" TEXT, "type" TEXT, "date" TEXT, "works number" DECIMAL, "notes" TEXT)

how many total trains were build in 1949 ?
SELECT COUNT("number") FROM table_204_77 WHERE "date" = 1949
SELECT COUNT("number") FROM "table_204_77" WHERE "date" = 1949