This came up in an email conversation I had with a member of the Dover Land Conservation Trust about access to a different trail in the area (I'm trying to clean up the bicycle access status). Her comments about this area were:
...The Donnelly trail is actually public access for walking & horseback. I have found ROWs marked on maps as early as 1920 and am working on documenting the ROW. The subdivision that refers & expands it was before mountain biking became a thing so biking is not explicitly permitted and, therefore, likely isn’t (I will be speaking to Town Counsel about this). In any case, the excessively steep hill probably makes it a bad idea from a safety & an erosion standpoint. 

The truly private trail(s) in the Miller Hill area are the ones in the Channing CR (Lesser & McKoy current owners) which is on the Farm St side of the RR tracks from almost Hunt Drive to Russo property (formerly R Healer). The CR is an early one & has NO public access. The access road for the RR tracks belongs to MBTA so not technically open but public ownership ;-) - you just can’t get off that toward Farm St until you reach DLCT land & then Springdale Meadows (Con Com = 46R Springdale Ave). Technically, Wylde Woods is not supposed to be used by bikes but we lost that battle long ago. Like Hale, we need to get some trail maintenance out of the biking community to compensate for the erosion (NHC already does a lot to compensate for the equestrian use).
