Posted by Jeff Sell on July 8, 2020 
Nice photo of the impatient steed! Can the headlight be relocated on the front of the smokebox? In this photo, the headlight is positioned on the center of the smokebox. But in RP photo #741733, the headlight is positioned at the top of the smokebox.
Posted by John Bowler on July 8, 2020 
Southern Steam Era Headcodes and Headsignals. Train headcodes were originally established by the Railway Clearing House and were based on the position of lamps on the front of trains, usually denoting class of train but also used to denote route, especially so by the southern companies. Over the years local variations were introduced by the individual railways which evolved into those we saw in use until the demise of slam-door rolling stock. The codes used by the Southern Railway and its constituents, were displayed by discs during daylight hours and lamps during darkness. In modern times the lamps are white but other colours were used during the nineteenth and early twentieth centuries. For further details on this please click on this link: http://www.semgonline.com/headcodes/sheadcodes/04.html
Posted by Jeff Sell on July 9, 2020 
John, thanks for the interesting follow up information. I never knew that the UK changed the position of the headlight based upon the train's operating region or train type.
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