CREATE TABLE table_203_19 (id DECIMAL, "number" DECIMAL, "builder" TEXT, "type" TEXT, "date" DECIMAL, "length" TEXT, "notes" TEXT)

in 1906 , how many total rolling stock vehicles were in service ?
SELECT COUNT(*) FROM table_203_19 WHERE "date" <= 1906
SELECT COUNT(*) FROM "table_203_19" WHERE "date" <= 1906