1980s. Bytom, Sikorskiego Sq. Route 31 cars - 1125 (revenue car - left) and 1127 (as reserve - right), both of N type. After shortening to Luzycka Street (1983), Route 31 was serviced only with single N type cars until 1989 when Wroclawska loop was built. For a short time cars of 105N type appeared on Route 31, but the service was soon replaced by extended Route 41.