user: Question: What is the Gauge of Builder Beyer, Peacock?
Columns: ['Gauge', 'Railway', 'Works no.', 'Year', 'Builder']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['750 mm', 'C.F. du Congo', '1744', '1913', 'St. Leonard, Belgium']
SQL:

assistant: SELECT "Gauge" FROM "Table" WHERE "Builder" = 'Beyer, Peacock';