user: Question: What is the total works number of the locomotive with 0-6-4T type after 1875?
Columns: ['Name', 'Builder', 'Type', 'Date', 'Works number']
Types: ['text', 'text', 'text', 'real', 'real']
Sample row: ['Snowdon Ranger', 'Vulcan Foundry', '0-6-4T', 1875.0, 739.0]
SQL:

assistant: SELECT SUM("Works number") FROM "Table" WHERE "Type" = '0-6-4T' AND "Date" > 1875.0;