This bus has just unloaded passenger in Sardis Road and is going to what was, at the time, the end of the road to turn round. Behind can just be made out Pontypridd Guy Arab 33 whilst across the road is a Rhondda Tiger Cub. From another photograph from the same source this is likely to be 330 (NTG 141) going to Pontyclun.
From an original negative in the David Beilby collection, photographer unknown.