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_name_1 (specification VARCHAR, total_produced VARCHAR, model VARCHAR)

### Question ###
What is the specification of the locomotives with a total produced more than 19 and a model of fb-1?

### Accurate SQL ###

SELECT specification FROM table_name_1 WHERE total_produced > 19 AND model = "fb-1"