Iron Manimal by H. Seitz
A catastrophic train wreck gives a circus troupe and their tiger baffling new powers. Stranded and confused, they must find new ways to cope with the world and each other. Is a person who can read minds actually being led and controlled by the thoughts of others? And if power comes through physical and emotional trauma, what happens to a newly powerful person or entity who still thinks and feels like a victim? Alcoholism and the death of American rail are also explored.