Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_46571 ( "Number" real, "Builder" text, "Type" text, "Date" real, "Works number" real )

### Question ###
What is the sum of number with type 0-4-4 forney locomotive, number smaller than 20 and works number of 1251?

### Accurate SQL ###

SELECT COUNT("Date") FROM table_46571 WHERE "Type" = '0-4-4 forney locomotive' AND "Number" < '20' AND "Works number" = '1251'