I have an HO scale Union Pacific GP38-2 that I would like to detail. I have found all of the parts I want except for the two strobes on the cab roof. I have looked at Details West, Details Associates and Walthers and have not found anything that looks like them. Does anyone know where they can be purchased or how to scratch build them? I would be nice if they worked but non-working ones are okay.
I believe there was also a recent article in MR (maybe 2 or 3 issues back) about scratch-buildiong and installing one in a locomotive. It incorporated heat shrinking an LED like David has suggested. I’ll see if I can’t track down the specific issue for you.
Looks like it was a little farther back than I thought. I did an online search in the back issues and found the following article in the April 2009 issue of MR:
Working beacons for diesels
Flashing lights increase N scale locomotive realism By Lennart Svedberg
Maybe not the exact thing or scale but perhaps it would give you some additional ideas to work with.