Photos copyright T. Shackleton     As long-promised, I am about to embark upon my GT3 build. In the absence of surviving works drawings, it seems unlikely that even Heljan will take this one on, and I have always been determined to have a model of this iconic locomotive.   GT3 was, by all accounts, very successful, but the prevailing rush to eliminate all traces of steam-age power from BR mitigated against it, and the sudden surge in the price of oil dealt the death-blow to the project.