Thanks @VHubbard.
Hmmm, good question @gunrunnerjohn. I had envisioned them blinking at the same time, but alternating is certainly something I'm going to think about. I'm putting them into the tail lanterns of a 6517 caboose. I could see that alternate blinking might be something approaching my version of realism on my railroad. I was also going to put them into the taillights of the 68 executive inspection car, and for that they would be definitely flashing together.