1950s. A set of Bremen cars on a viaduct (built in 1893 and still existing) over the old railway line Gliwice - Bytom (abandoned today). Also a Hungarian Mavag type bus, most probalbly as Route 6 Gliwice - Katowice.
Photo from 'Komunikacja tramwajowa w aglomeracji katowickiej' by K. Soida (1998).