Surviving mainline locomotives
Posted: Wed Feb 24, 2010 1:09 pm
I am currently laid up and I wanted a minor project to help me fill in the time.
I always knew that the LNER had fewer surviving locomotives than any of the other “Big Four” companies but I had never seen the results quantified. So I set myself the task of finding out. I think that I still have not shaken off the old habits as a statistician in a former life.
Soon after I started I realised that this was not a straightforward task, there were many grey areas, so I had to set myself some ground rules especially about what to include and where to include it. Some other person performing the same task would probably end up with a different set of results (lies, damned lies & statistics).
To add a bit of extra interest, I grouped the locomotives into several age ranges.
So for what it is worth, I have produced a summary of my results, and indeed it shows fewer LNER and LNER constituent locomotives than any other group (except for BR Standard types). However, take a look at the variety of types (classes), this shows the data in a rather different light, maybe quality rather than quantity?
I should point out that I am still working on the data and there could be the odd discrepancy, but I am confident that the data shows a good general picture.
If anyone is interested then I can explain how I arrived at the results and the decisions I took, but for the time being I will give the summary table and let the figures speak for themselves.
PS I have attached a pdf file containing the summary data, does anyone know if it is possible to display it as part of the posting?
I always knew that the LNER had fewer surviving locomotives than any of the other “Big Four” companies but I had never seen the results quantified. So I set myself the task of finding out. I think that I still have not shaken off the old habits as a statistician in a former life.
Soon after I started I realised that this was not a straightforward task, there were many grey areas, so I had to set myself some ground rules especially about what to include and where to include it. Some other person performing the same task would probably end up with a different set of results (lies, damned lies & statistics).
To add a bit of extra interest, I grouped the locomotives into several age ranges.
So for what it is worth, I have produced a summary of my results, and indeed it shows fewer LNER and LNER constituent locomotives than any other group (except for BR Standard types). However, take a look at the variety of types (classes), this shows the data in a rather different light, maybe quality rather than quantity?
I should point out that I am still working on the data and there could be the odd discrepancy, but I am confident that the data shows a good general picture.
If anyone is interested then I can explain how I arrived at the results and the decisions I took, but for the time being I will give the summary table and let the figures speak for themselves.
PS I have attached a pdf file containing the summary data, does anyone know if it is possible to display it as part of the posting?