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_51104 ( "Owner" text, "Class" text, "Number in class" real, "Road numbers" text, "Built" text )

### Question ###
What was built in a class with less than 10, and the Downer Rail owner?

### Accurate SQL ###

SELECT "Built" FROM table_51104 WHERE "Number in class" < '10' AND "Owner" = 'downer rail'