When the Maymorn loop was removed two signals were retained as intermediates. The Signalling and Interlocking circular shows signal 3901 as a single unit signal with a marker light. This signal was originally the Maymorn Down Home and the lower searchlight unit has been retained as the marker light.

Right - Signal 3901 with the rear of 3900 in the distance.

Note that signal 3900 is approximately 90m from the 39km peg so perhaps should be numbered 3802.