Sumpter 250's duff challenge

[Schraddel]

This way, changing the bulb will be easier. Remove motor assembly; change bulb and re-solder; re-install motor assembly; Done!

Blubb? :?:

O.K. let me explain.

blub light:

Behind the smokebox front a bulb in an piece of brass tube soldered onto the inner side of the front.
A small bore and another one through the rear sie of the front light casing.
A light guide in form of an clear styrene rod should guide the light of the bulb into the front light.
That is all what was coming out at 15V.

Now the rebuilt with LED:

A wired warm white 0603 type LED with an 1kohm resitor at 12V.

Those LEDs are small enough to fit direct into the light casings. You will only pay attention to choose the correct resistor.
And if they are mounted properly and work, they will outlast any bulb. So changing is no more necessary.
There is also a wide variation of coulor tones and shades available, from 1800's kerosene lantern to modern incandescent light.

My 2 cent.

I read your articles with great interest, following the progress of this narrow gauge mallett

Lutz