The R-26 was put into service in 1959-1960 and delivered with an olive green color. They did not have any “mta” signage at the time, since it was before the mta (the mta was created in 1965). So if you have a green model, its is perfectly ok without a logo. If you have one the other MTH R-26 models in repainted blue/silver or red after 1965, you can look through the photos here, which shows the r-26s repainted and in service through subsequent decades, with all the different variations of MTA logos and paint schemes -
https://www.nycsubway.org/perl...LG5kYXklMjBhc2N8MA==
If you want your engine to reflect the R-26 as delivered, it is fine without any mta logo, particularly if you have the original MTH green model and intend to keep it in that original olive green color. However, if you have one of the other MTH r-26 paint schemes (silver/blue stripe, red) or you want to repaint your green train and model a later, post 1965 train, you need to find the right MTA sign for that era/timeframe. Then purchase them from Islandmodelworks. I used the appropriate “modern” or current mta logo for my r-33 mth Redbirds that I wanted to reflect the late 1990s era and placed them exactly like in the photos I was copying from the above linked site (I just searched for r-33s instead of r-26s). I believe I used the 30” scale versions of the island decals (which still seemed a little small but worked out fine), but just to make sure, call Island at the contact info on their website. I did that when I had the same question and the owner kindly walked me through the correct size purchase. When applying, use micro set and micro sol to seal them, then tape up the windows and apply a light coat of spray sealer after everything dries. Good luck!
