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_70733 ( "Model" text, "Build date" text, "Total produced" real, "Wheel arrangement" text, "Prime mover" text, "Power output" text )

### Question ###
What is the average total produced when the prime mover is 12-251c?

### Accurate SQL ###

SELECT AVG("Total produced") FROM table_70733 WHERE "Prime mover" = '12-251c'