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_13539 ( "Class" text, "Wheel arrangement" text, "Fleet number(s)" text, "Manufacturer" text, "Year made" text, "Quantity made" text, "Quantity preserved" text )

### Question ###
What is the Quantity made when class is f-7?

### Accurate SQL ###

SELECT "Quantity made" FROM table_13539 WHERE "Class" = 'f-7'