Originally Posted by bike_tom

Hi. This map posted by Bedford shows the paths along the Elm and Mongo brooks: https://www.bedfordma.gov/DocumentCe.../Elm-Brook-PDF
Here is an annotated snippet from Google Maps that shows the route I normally take:
From the Depot, you ride just a couple hundred feet south on South Rd. There is a red fire hydrant just before the path into the woods. I actually found this by exploring from the other direction, that is coming from the Reformatory Branch Trail, where there is a significant intersection at the Mongo Brook.
I like this because it bypasses Railroad Ave. Also, you don't have to cross Railroad Ave twice (assuming you would ride on the right side of the road from the Depot to the RBT parking lot), just South Rd, which you would have to cross in any case.

Let me know if you need more info.