try going to mapquest.com,
put in "notown" and "vt"; when it comes up, click "big map", and then scroll south from there to Massachusetts, looking at the towns and places in Windsor and Windham Counties VT, to see if anything strikes your eye as similar to "Wynamick".
 
Mapquest does a pretty good job of showing arcane and unique "places" that are only known to the locals and the railroad.  You can also zoom in and see a smaller area in more detail, for names of creek branches, etc.
 
There is a Wymans Falls in Windsor, and Windham and Windmill Mountain in Windham [from looking at GNIS using w% for each county]
 
Mike RANSOM

 

There was also a reference to what appears to be a town or settlement; it is an old hand-written document, but seems to read " Wynamick"

 

 

 Does this ring a bell with anyone?