Sorry. It thought that only people who had heard of 'Heavy Harry' would try to answer. Someone asked my husband this question today, and I thought I might be able to get an answer from someone on Yahoo7 answers. It could have been steam, but I am not sure. It was in Australia, possibly Victorian Railways. Apparently it only ran on the main line between Melbourne and Adelaide because it was too heavy to use other lines because it would damage the tracks. It is probably in a museum somewhere, but I really don't know much about it.
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