According to the following, it implies that preganglionic neurons are interneurons.
Interneuron called preganglionic neuron whose cell body is situated in the "intermediolateral" column of spinal cord( also called 'lateral column').1
The interneuron (connector neuron) of somatic system has cell body in the dorsal horn and terminates in the ventral horn, while that of ANS has cell body in the intermediolateral horn and terminates in the autonomic ganglia....In the ANS, there are two efferent neuron chains between CNS and the effector organ: first efferent neuron (pre-ganglionic neuron) has its cell body in CNS while the second efferent neuron (post-ganglionic neuron) has its cell body out-side the CNS in the ganglion.
But this source implies quite opposite:
The spinal sympathetic interneurons that most directly influence the activity of sympathetic preganglionic neurons after spinal cord injury....
So which one is correct?