Unusual train on Tracksy

Just scrolling through Tracksy and having a gander at my local station (RCD) and noticed this strange train with the headcode 5L66. Clicked and it seemed that the train was a South Western Railway EMU! Given that this line is entirely unelectrfied and is devoid of both third rail and overhead wires, it's clear that this train doesn't belong here.

I'm guessing it's possibly a wrong headcode or something. Perhaps it's also a train being passed from one TOC to another and is actually being pulled by a diesel locomotive. Any other ideas?