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_3635 ( "No" real, "Origin City (Country)" text, "Destination City (Country)" text, "Train Name No" text, "Operator Name" text, "Distance" text, "No. of Stops" text, "Frequency" text, "Scheduled running time" text )

### Question ###
What is the operator name when the distance is 3105km?

### Accurate SQL ###

SELECT "Operator Name" FROM table_3635 WHERE "Distance" = '3105km'