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_77985 ( "Line" text, "Began operation" real, "Stations" real, "Length (km)" text, "Terminals" text )

### Question ###
When is the earliest began operation with a length of sultan ismail and over 27 stations?

### Accurate SQL ###

SELECT MIN("Began operation") FROM table_77985 WHERE "Length (km)" = 'sultan ismail' AND "Stations" > '27'