UnclePete, I used: DD01WM Pre Wired White Strip LED 3528 I got from Amazon. Came in pack of 10 as I recall.
They use 12V-18V. I have used a lot of them to light up old Lionel buildings. I use an old K Line transformer from a set to power all of them up around the layout.
The Diner itself uses the Menards 4.5V power supply.