These are the official GNR painting specifications for buildings & other structures issued in 1899 and 1915. It gives a remarkable insight into how a pre-group company painted infrastructure.
1899 Specification:
![GNR](http://farm7.static.flickr.com/6023/5905260304_7994703d34_b.jpg)
![GNR](http://farm7.static.flickr.com/6001/5905260390_c78e83a482_b.jpg)
1915 Specification :
![GNR](http://farm6.static.flickr.com/5151/5904701281_832c3f3c43_b.jpg)
![GNR](http://farm7.static.flickr.com/6054/5904701373_f0cf74ebf9_b.jpg)
![GNR](http://farm7.static.flickr.com/6014/5905260806_ab49edecc7_b.jpg)
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