I have here a bridge plate. Now in the whole of the UK there remain about 8000 rail bridges numbered sequentially on the individual routes that they are on. There can't be any numbered higher than a few hundred. Following convention this would therefore suggest that the plate shown must be from a VERY long route! It is of aluminium and in an a typeface that suggests 1900 - 1930 to my mind. I'm reckoning India, maybe South Africa or possibly the US. Any ideas?