Lionel lighted lockons retail for $9.99, and can run up to $25 or more online.
You can build this one for a buck or so, depending on how handy you are and what your parts bin looks like...
1) Lionel lockon, preferably somewhat beat-up as you are going to be Doing Things to it.
1) Screw-type E-10 bulb base. I used Radio Shack 272-0360 E-10 bases.
1) 4-40 screw and nut.
Flatten the Fahrenstock clips. This is probably the most useful they're ever going to be.
Drill a hole for the 4-40 screw.
Bend the base bracket into a U shape.
Bolt the base to the lockon.
At this point, I decided to get cute and bend up the little Fahrenstock clips...
...And solder them in place. Note that the tabs can be used to attach spade type connectors if desired.
The light in action. Isn't it pretty?
If you run into clearance issues...
I recommend the Mark II model. Same procedure, but you flatten the bracket instead.
Clearance issue solved!
When I do the Razorback Traction rebuild, I plan to solder the feed wires directly to the underside of the rails.
But, the lockons will be handy for checking the state of the track power at the far corner of the layout.
As always, SCROUNGE!