Since Google Maps started the Cycling feature, I've reported several issues about the cycling routes they choose. One problem report I files was about the little cut-through that everyone takes to get from a freeway service road over to another street that crosses a train track. Not only do they now allow cycling traffic through that little path, they've marked it as a bike path now (in bright green):

There it is, The Doohickie Cut-Through.

It lies along a popular commuting route, and is just a little north of an entrance to the Trinity Trails MUP (which you can see if you zoom out a little and follow the access road south).