Brianne was a scrapped tender engine character in earlier drafts of The Railways of Crotoonia.
A spunky, hard-working quarry engine, she would have seen focus in stories of her own in early plans of the series. Her model was a simple design; an usual 2-4-0 version of James (in his black livery) was repainted magenta, and given a facelift. When two USB drives containing animation data for Crotoonia was lost in 2014, so was Brianne.
Brianne is of a freelance design. Therefore, she is not based on a specific prototype.
She is painted magenta with red lining and a gold dome.