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_76907 ( "Class" text, "Wheel arrangement" text, "Fleet number(s)" text, "Year made" text, "Quantity made" text, "Quantity preserved" text )

### Question ###
What is the wheel arrangement with 1 quantity preserved?

### Accurate SQL ###

SELECT "Wheel arrangement" FROM table_76907 WHERE "Quantity preserved" = '1'