Hello,
I apologise for reviving a three year old topic that I'm sure you've all long since moved past, but in the North Eastern Railway Association archives there is a document titled "Diagram of Bevel Drive Vehicle", catalogue ID KT01395-24, which is an overall dimensions plan for this particular locomotive. Its signed in the bottom right-hand corner as being from the Locomotive Department of Darlington, August 3rd of 1921, so still under the NER. The scale is a 1/4 inch to 1ft. A stamped-on roundel gives the impression of the plan having been archived on the 8th of April 1952, the remaining writing saying "The railway execu...Darlington". In the top left corner it says "DG.N°9834".
A rough description of the locomotive from the drawing:
A short 0-6-0 frame with buffers mounted on both ends, around 24ft in length with doors, windows and access hatches identical to those found on the NER's EE1. The door is located to one end of the body, with a single window on the side in the middle and two access hatches to the back. It has an arc roof with railings at either end, presumably for adjacent-line wagon hauling. Electrical shoes are mounted between the wheels, with two per side. Its side is marked with "NE.R" in large lettering , and under the access hatches, its marked with "Chief Mech Engrs Dept". Total weight is a little over 31 tons.
Due to the placement of access hatches, I'm inclined to believe that the engine could only be operated from one end, that being what is presumably the forward end. With the door where it is at the end with a single window in the middle and the rest of the side consumed by hatches, given the size it was probably 90% electric motor inside with a small space for maintenance purposes.
I have only not sent the image as I lack the permission to send it.
Thank you.