user: Question: How many constructions has a Wheel arrange- ment of 4-4-0?
Columns: ['Builder', 'Construct- tion no.', 'Date ordered', 'Wheel arrange- ment', 's Cylinder', 'Engine weight', 'TC&StL no. (1883–84)']
Types: ['text', 'real', 'text', 'text', 'text', 'text', 'real']
Sample row: ['Baldwin', 4207.0, 'December 1877', '4-4-0', '12×in (mm)', 'lb (kg)', 2.0]
SQL:

assistant: SELECT COUNT("Construct- tion no.") FROM "Table" WHERE "Wheel arrange- ment" = '4-4-0';