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 train ( train_id number, name text, time text, service text )
TABLE: CREATE TABLE train_station ( train_id number, station_id number )
TABLE: CREATE TABLE station ( station_id number, name text, annual_entry_exit number, annual_interchanges number, total_passengers number, location text, main_services text, number_of_platforms number )

### Question ###
How many train stations are there?

### Accurate SQL ###

SELECT COUNT(*) FROM station