user: Question: How much Quantity has a Type of 1′c1′ h2t?
Columns: ['Class', 'Railway number(s)', 'Quantity', 'Year(s) of manufacture', 'Type']
Types: ['text', 'text', 'real', 'text', 'text']
Sample row: ['B(Krauss) ( de )', '172–177', 6.0, '1867–1868', 'B n2t']
SQL:

assistant: SELECT SUM("Quantity") FROM "Table" WHERE "Type" = '1′c1′ h2t';