The orderly movement of a spinal cord motor neuron from one site to another. A spinal cord motor neuron is a motor neuron that passes from the spinal cord toward or to a muscle and conducts an impulse that causes movement. [ http://purl.obolibrary.org/obo/CL_0011001 GOC:yaf http://www.ncbi.nlm.nih.gov/pubmed/20711475 ]