Hi Ryan, the end windows like you mentioned are aluminum frame windows that bolt into place as one piece. Unfortunately the window is long gone. 1288 and 1291 had a total of 3 end windows each, but 1 on each caboose was plated over and missing, so I only had a total of 4. I stole one from 1288 to use on 1291 after I removed the steel plate, which made me short 2 windows for 1288. I was able to get one window from 1292, but only one was still there so I am still one short. I have no idea where to find another that matches the dimensions ! I have found windows from other cabooses but the sizes do not match. I basically have two options, I can leave the window plated on 1288 and have one original window on each end, or I can unplate the window on 1288 and use a standard laminated glass with a rubber seal, like on the end windows on 1200-74. Using a standard laminated window with rubber will require a modification on the interior, but nothing major. . I like the idea of unplating the window, but do not like the rubber seal idea simply because of changing the look of the caboose. Since 1288 will be restored orange and white, I may just leave the window plated since it would be period correct, but I will definitely unplate all the side body windows. So to answer your question, I don't know yet ! haha. I want to unplate the window, but I'm not sure if I want to compromise and use the rubber seal.