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GNR Express Engine 1892
The 7 foot six inch express engines were the unsung heroes of the GNR. They outnumbered and outperformed the outside cylinder engines.
EXPRESS ENGINE GREAT NORTHERN RAILWAY.
* It is not to be supposed that the Great Northern express traffic is worked entirely by the outside-cylinder engmes albeit Stirling's engines with 8ft. drivers have earned a. worldwide reputation. For many years inside-cylinder engines have played an important part on the line, and Mr. Stirling has found it worth while to perpetuate this type."
It is interesting to note that the film footage of a Stirling Single taken at Wood Green station in the 1890's features an inside cylinder single and not one of its more famous sisters.