In a company created electricity metering, I heard a similar story of a train fetching logs in the mountains in Scandinavia. The train left the station in the

In a company created electricity metering, I heard a similar story of a train fetching logs in the mountains in Scandinavia. The train left the station in the valley empty and returned fully loaded with logs from the mountain. At first they didn't believe their own measurements, but it was effectively generating electricity.