user: Question: How many railroads have the numbers 864-873?
Columns: ['Order number', 'Build date', 'Serial numbers', 'Country', 'Railroad', 'Numbers', 'Quantity']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['711197-711208', 'February 1970 - March 1970', '34671-34682', 'Brazil', 'E. F. Vitória a Minas', '801-812', 12.0]
SQL:

assistant: SELECT COUNT("Railroad") FROM "Table" WHERE "Numbers" = '864-873';