It's been my observation that places that offer (or, more accurately, advertise) "tracks" tend not to have things like "mentors" and "labs." If you want SMI experience as an in-house part of your graduate training, find a mentor-model training program with a mentor that is doing research in SMI. As a second option, find a mentor-model training program with a mentor that will support you doing your own research or external work with SMI (e.g., through practicum placements, thesis/dissertation), despite it not being the primary focus of their lab. A large cohort program with specialty training tracks might not be a great option, as the "tracks" may be defined more by the curriculum and what is taught, vs. the expertise of who is doing the teaching or direct access to the population that is being taught about. If you are going to invest huge amounts of time and money into the next almost decade of your life, be certain to distinguish marketing gimmicks from actual in-depth training opportunities. There may be some really good "specialty training track" model programs, but there are definitely some pretty awful ones. Caveat emptor (and many of these programs see you as nothing more than an "emptor"!).