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_1688640_4 ( year_started INTEGER, car__number VARCHAR )

### Question ###
Name the year started where car number is 55

### Accurate SQL ###

SELECT MAX(year_started) FROM table_1688640_4 WHERE car__number = "55"