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A 3,000 gallon milk tank wagon.
These were introduced after the increasing demand for fresh milk by big cities made the previous system of transporting milk churns too cumbersome.
The dairy owned the tank, but the railway owned the under frame. At first they ran on 4 wheeled under frames, but they rode badly and often churned the milk. Baffles were soon installed and a 6 wheel frame substituted, which alleviated the problem. This basic design lasted for over 50 years before milk traffic on BR stopped in the 1980s.
