I believe it is POGO, backed up by the sign visible in the picture posted on
this railcam news article (right below). The writing on the sign isn't fantastically clear, but compared to a photograph of a POGO sign included in the
Frognal Farm RAIB report (left below) it does look as though the text is the same and instructs users to press a button to open both gates as is the function of a POGO.
View attachment 101456
[Image shows two signs side by side, the one on the left considerably clearer than the one on the right. The instructions on the sign on the left read:
Always telephone before crossing with vehicles or animals to find out if there is time to cross
Tell the crossing operator if the vehicle is large or slow moving
- Push green button to open both gates
- Cross quickly
- Push green button to close both gates. Maximum penalty for not doing so £1000]