To make sure that this identity will not be challenged, he has put the unfortunate C.M. on a freight train bound west.
In his literal-minded way, he actually dumps C.M. into a boxcar, sending him on a one-way ride.
He is trying to take the place of C.M., who in turn seems to want to take the place of Claude McKay - "a forgotten Jamaican writer," as a sneering character puts it, who thought of himself as international" (22).