These led's are great to replace Atlas bulbs DC/DCC or for use in Proto/Walthers loco's when DCC is added and the 1.5 volt bulbs need to be replaced. They are 12 volt ready to install with no soldering required just cut to the desired length and strip the ends. The pictures show what you will get 2 assemblies and also show them installed in an Atlas SD35 frame and lit. I would usually put black electrical tape over the tops to prevent the light from showing through the roof. They  generate no heat so melting the shell is not a worry like the Atlas 12 volt bulbs that need a rubber casing.

    These led's are perfect for use in DC or DCC decoder installations where ever professional-looking LED lighting is desired.They can be used with all major decoder brands with 12 volt lamp output including TCS (Train Control Systems), NCE (North Coast Engineering), MRC (Model Rectifier Corp), Lenz, ESU-Loksound, QSI, Digitrax, and Soundtraxx.