  In this article we construct uncountably many new homogeneous locally finite
Steiner triple systems of countably infinite order as Fra\"{\i}ss\'{e} limits
of classes of finite Steiner triple systems avoiding certain subsystems. The
construction relies on a new embedding result: any finite partial Steiner
triple system has an embedding into a finite Steiner triple system that
contains no nontrivial proper subsystems that are not subsystems of the
original partial system. Fra\"{\i}ss\'e's construction and its variants are
rich sources of examples that are central to model-theoretic classification
theory, and recently infinite Steiner systems obtained via Fra\"{\i}ss\'e-type
constructions have received attention from the model theory community.
