Excellent find that.
The article suggests that the locomotive was of German origin, and I would agree, most likely produced by Siemens Schukurt in Berlin. It is a design known as 'Steeple cab' and they have been quite common in the UK on private lines in the past, to name but a few:
1. Harton Electric Railway (South Shields) - 15 locos (of various ages) and the largest user up until 1989!
2. Kearsley Power Station (Near Bolton) - 2 locos
3. Heysham Power Station - 2 or 3 locos
4. York Foss Island power Station 1 loco
5. Courtaulds at Spondon - 2 locos
6. Failfields shipyards, Govan - 1 loco
7. Newcastle quayside branch - 2 locos (up a 1 in 20 gradient tunnel which still exists!!)
And many more, all sadly long gone. The Hellingly one is a little gem!