Many thanks Dr Chris always my Hero 
I was probably thinking of the 'Swallow' insignia that are on a couple Plarail Steamers. Your information is great and tells the whole story and, yes, the pictured design is from my Plarail D51-882 which makes it even more rare now that it has a one of a kind design on it. I find it curious as to the article that, if it really truly is only found on one engine, the D51-882, then why is there some pictures that show the crescent moon facing in different directions. To my knowledge of numbering there could only be one engine designated as an 882 which is specific to its production I think, so how could there be different moons?
I was probably thinking of the 'Swallow' insignia that are on a couple Plarail Steamers. Your information is great and tells the whole story and, yes, the pictured design is from my Plarail D51-882 which makes it even more rare now that it has a one of a kind design on it. I find it curious as to the article that, if it really truly is only found on one engine, the D51-882, then why is there some pictures that show the crescent moon facing in different directions. To my knowledge of numbering there could only be one engine designated as an 882 which is specific to its production I think, so how could there be different moons?
![[-]](https://www.blueplastictracks.org/images/collapse.png)