The calculated distance (air line) between Duque de Caxias and Barra do Piraí is approximately 39 miles respectively 63 kilometers.
By car or train, the actual journey to Barra do Piraí is certainly longer, as only the direct route (as the crow flies) between Duque de Caxias and Barra do Piraí has been calculated here.
Air line (approximately)
63 kilometers
34 nautical miles