I know when I rode the fall photo special...
The hand out had statements that stated that in no way could the photos taken durring the event be sold. As the name, and train and any likeness (could include the lettering that is unique) were the registered property of the D&S etc. It might be a little more difficult to enforce since they don't have you sign it and return it to them. But there is likely something even in the fine print on the tickets?
But I'm not an lawyer and have no reason to fight it.
SO yes there are restrictions...