user: Question: What is the number range for the Gloucester RCW builder introduced in 1937?
Columns: ['Number Range', 'Introduced', 'Builder', 'Engine', 'Seats', 'Withdrawn']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1', '1934', 'Park Royal', '1 AEC of hp (kW)', '69', '1955']
SQL:

assistant: SELECT "Number Range" FROM "Table" WHERE "Builder" = 'Gloucester RCW' AND "Introduced" = '1937';