Here is an in-depth review of Trail of Cthulhu by Michael Harnish. Mr Harnish understands why GUMSHOE is not “railroady”, too.
By now it should be evident that I really love Trail of Cthulhu. I think it manages to capture the feel and style of HPL’s stories, particularly when played in Purist mode, with rules built to complement the stories. GUMSHOE is a perfect fit for investigative type adventures, and well-suited for a plotted out set of scenes. It also is simple enough to be run in a more “off-the-cuff” improvisational style and doesn’t require a great deal of prep on the part of the Keeper, an important consideration for those of use with other daily commitments.