CREATE TABLE table_204_476 (id DECIMAL, "name" TEXT, "date built" DECIMAL, "builder" TEXT, "works no." DECIMAL, "wheels" TEXT, "cylinders" TEXT, "notes" TEXT, "withdrawn" DECIMAL)

how many were built in 1847 ?
SELECT COUNT(*) FROM table_204_476 WHERE "date built" = 1847
SELECT COUNT(*) FROM "table_204_476" WHERE "date built" = 1847