user: Question: What livery was worn on the date before 1936, with the description of Gresley RF?
Columns: ['Number & Name', 'Description', 'Livery', 'Owner(s)', 'Date']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['No. 18033', 'Gresley CK', 'N/A.', 'Railway Vehicle Preservations .', 1924.0]
SQL:

assistant: SELECT "Livery" FROM "Table" WHERE "Date" < 1936.0 AND "Description" = 'Gresley RF';