I don't think it is a great comparison to be honest. The Titanic disaster has a 50 year headstart on the Great Train Robbery, and it was only since the mid-1990s, as the last survivors passed away, that the rampant commercialisation has taken off and the associated developments have materialised in Belfast. I guess the same point will come in the GTR story, but perhaps we all not there yet?
Hypothetical question - Would it be ok for a manufacturer to produce the locos from the Quintinshill rail disaster, and market it as such?