Under LSWR ownership the S15s were painted in the late LSWR dark Holly Green livery, with the same black and light green lining applied to most of the LSWR's freight designs.
Gilt lettering and numbering was located on the tender and cabside respectively.
The initials "LSWR" were located on the tender.

The first Southern Railway livery continued that of the LSWR, but with the number displayed on the tender.
However, from 1925, a darker Olive-type green was substituted, and the entire class was so painted.

Wheels were green with black tyres, and the cabside numbers were replaced by a cast oval plate with "Southern Railway" around the edge and the number in the centre.
Primrose Yellow "Southern" and locomotive number transfers were placed on the tender tank.
From 1927 the Maunsell locomotives were given black livery with green lining, and remained in that guise with little modification until nationalisation.

The only slight livery modification occurred before the Second World War, when Oliver Bulleid introduced the "Sunshine Yellow" lettering and numbering.
A further modification was the application of a green shaded "Sunshine" lettering during the war.
This was finally reverted to "Sunshine Yellow" lettering and numbering after the war.
Nos.496–515 were built between 1919 and 1921, Nos.823–837 were delivered from Eastleigh during 1927 and 1928 and a further ten, No.838–847, were authorised in 1931.
Under LSWR ownership the S15s were painted in the late LSWR dark Holly Green livery, with the same black and light green lining applied to most of the LSWR's freight designs. Gilt lettering and numbering was located on the tender and cabside respectively. The initials "LSWR" were located on the tender.
The first Southern Railway livery continued that of the LSWR, but with the number displayed on the tender. However, from 1925, a darker Olive-type green was substituted, and the entire class was so painted.
Wheels were green with black tyres, and the cabside numbers were replaced by a cast oval plate with "Southern Railway" around the edge and the number in the centre. Primrose Yellow "Southern" and locomotive number transfers were placed on the tender tank. From 1927 the Maunsell locomotives were given black livery with green lining, and remained in that guise with little modification until nationalisation.
The only slight livery modification occurred before the Second World War, when Oliver Bulleid introduced the "Sunshine Yellow" lettering and numbering. A further modification was the application of a green shaded "Sunshine" lettering during the war. This was finally reverted to "Sunshine Yellow" lettering and numbering after the war. Nos.496–515 were built between 1919 and 1921, Nos.823–837 were delivered from Eastleigh during 1927 and 1928 and a further ten, No.838–847, were authorised in 1931.
LSWR S15 class