During the early 1900s the N.E.R. utilised the S3a Type of box when quadrupling part of the Y&NMR line in Yorkshire between Chaloner's Whin and Burton Salmon.
The S3a type was also found at several other sites across the Southern Division of the N.E.R. with an example of the type being built as late as 1910
at Whitby Bog Hall Junction. The Southern Division encompassed most of the company's lines which were in Yorkshire.
This model is based on the S3a type box located at Severus Junction/York Yard North as it was between approximately 1939 and 1968.
Frank Routledge did the research and was responsible for many of the photo textures, Chris (Nawlins) gave lots of input as well. V2 works better for lod in TS19.