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5 Mile Diagrams and Gradients

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Legolash2o

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I'm currently mapping gradient data in a huge amount of detail (more detailed below). I'm currently using TRATIM data and then cross referencing them with 5 mile diagrams.

In a few cases, they don't match and I'm wanting to determine which one to trust. Where do the 5 mile diagrams get the gradient data from? Was it manually entered?

Some times the 5 mile diagrams are off that looks like someone hit the wrong key on a numpad (8 instead of a 5, 7 instead of a 4, 3 instead of a 6). In other cases they are off quite considerably.


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pdeaves

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Five mile diagrams are (were?) created manually. I believe the source data was mainly signalling plans, on which gradients are not the primary focus, and subject to transcription errors.
 

Dunfanaghy Rd

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I downloaded a few while still working. they had a number of errors (I believe they were a draft version). For instance: at Hamworthy the signal box was shown on the Up, not the Down.
One aspect that has always intrigued me, and I hope someone has an answer - the symbols used for type of buildings, bridge construction, &c. were the same as used by the Southern Railway in the 1930's. Was there a standard / convention for such things?
 

edwin_m

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Five mile diagrams are (were?) created manually. I believe the source data was mainly signalling plans, on which gradients are not the primary focus, and subject to transcription errors.
The minimum spacing between signals depends on the gradient, so I'd like to think they are accurately shown on signalling plans. That doesn't of course rule out transcription errors going from the plan to the 5MD.
 

Legolash2o

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I think I've decided to use the TRATIM data as the master source and just assume the 5MD are the ones that are wrong (in the few cases).

Where do the signal diagrams get their gradient data from?
 
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