There was a aggregates hopper in Godstone sidings for years. I don't think it was lost - it probably had with some sort of immobilsing defect. It was there in about 2000/01 when I first started using the Redhill-Tonbridge line on a regular basis and it finally disappeared after about five years.
I think the Russian railways have been reputed to have lost whole trains between Moscow and Vladivostock.
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