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_20184 ( "Class" text, "Wheel Arrangement" text, "Railway" text, "Number at Doncaster" real, "Number at Pyewipe" real, "Number at March" real )

### Question ###
Name the number of wheel arrangement when class is d14

### Accurate SQL ###

SELECT COUNT("Wheel Arrangement") FROM table_20184 WHERE "Class" = 'D14'