user: Question: How many are named River Esk
Columns: ['No.', 'Name', 'Livery', 'Arrival', 'Type', 'Configuration', 'Builder', 'Built', 'Status', 'Location']
Types: ['text', 'text', 'text', 'real', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['3', 'River Irt', 'Mid Green', 1917.0, 'Steam', '0-8-2', 'Sir Arthur Heywood', 1894.0, 'Under overhaul', 'Workington']
SQL:

assistant: SELECT COUNT("Built") FROM "Table" WHERE "Name" = 'River Esk';