Is this really Advance Signal V502? 

Because https://www.openstreetmap.org/node/3375688393 also claims to be "V502" -- but the latter has a main signal labeled "502" https://www.openstreetmap.org/node/3372375804 whereas the main signal corresponding to this advance signal is labeled "503": https://www.openstreetmap.org/node/3372366000