1967 started a period of fast decline in both the number of trolleybuses and the trolleybus lines in Warsaw. The national government policy at the time was that as much Polish coal as possible be exported while the oil be imported at very low prices from the USSR.
1967 marked a swift downturn in both trolleybus numbers and routes in Warsaw. The national government's policy at the time was to export as much Polish coal as feasible while importing oil from the USSR at extremely low prices.