Hornby also model European & North American trains - Rivarossi, Lima, Jouef, Electrotren & Arnold.
European (mostly German) steam locomotives used to carry 2 x illuminated items mounted above the buffer beams on each side. Later, a third illumitated item was added higher up & central - this was to differenciate (speeling?) between road & rail traffic where unfenced railway lines run alongsidfe roads.
Early lamps were in fact huge on the locomotives that were not equiped with electic generators (hope that's the correct word - may be dynamo or alternator) or some form of electrical storage (such as dry cells or lead acid). Even some of the electrically powered illuminated items were still large - they used a white painted reflector & AFAIK a 25w Pearl lamp with an ediston screw bas but I have no idea of the voltage.
More or less carried over to diesel & electric but some also have a high intesity illuminated item which may or may not be called a headlamp or a headlight.
AFAIK filament lamps (as the componant, not the whole fitting/lamp) are known in some parts of the world as "globes".
There will of course be many variants..................