LSWR
After a period in the LSWR's early Yellow Ochre/Brown passenger livery, the 46 Class was outshopped in LSWR Passenger Sage Green livery, with black edging and black and white lining. Numbering was in gilt, as was the 'LSWR' lettering on the water tank side.
Under the LSWR numbering policy, the number of the first locomotive of a new design became the number of the class. As in this case the first locomotive was numbered 46, the class became known as the '46 Class.' The rest of the class were numbered 123, 124, 130, 132, 133 and 374–379.
LSWR numbering policy was, and continues to be, a highly confusing topic because the LSWR did not allocate a numerical series to a new class of locomotive. This resulted in many different classes of locomotives being numbered and mixed within series.
From 1903 to 1905, the locomotives were re-numbered according to the LSWR's duplicate numbering system. This meant that a '0' prefix was added to the LSWR numbers, and that the doyen of the class, number 46 became 046.
Read more about this topic: LSWR 46 Class, Livery and Numbering