CREATE TABLE table_43561 ("1946 Nos" TEXT, "1947 Nos" TEXT, "Date" FLOAT, "Built at" TEXT, "LMS Nos" TEXT, "BR Nos" TEXT)

Which Date has a 1947 Nos of 3525-34?
SELECT COUNT("Date") FROM table_43561 WHERE "1947 Nos" = '3525-34'
SELECT COUNT("Date") FROM "table_43561" WHERE "1947 Nos" = '3525-34'