What is an example of a freight-train sentence?
A freight train sentence is one that is quite long and used to express a character's train of thought, or sets a scene, or even organizes ideas from a jumbled confusion into a whole.
There are a couple of examples in the link below from published works. Let's see if I can throw one together...
The storm was approaching; the storm of doom and destruction that had levelled whole communities in the past, that had howled and blown and ripped families and homes from the very roots of their foundations, and that had taken her idyllic idea of a peaceful Mother Nature and thrown it into her subconscious abattoir where all nonsense and idiocy was sentenced to death.