"Turning the headlights on" for the 87015 external

Hi,

I've recently come back into the BVE scene, I was very into it years ago particularly around the time of BVE 2 and 4 but drifted away after OpenBVE was released as my PC couldn't run it and all the development focus shifted onto it.

I've been tinkering around with externals for various cabs that don't come packaged with one, one of these being the 87015 that comes with the Class 57 drag. I've managed to get the pantograph into an "up" state and make it so it generally looks like the leading loco. But I'm not sure how to get it so that the headlights can be changed so that they look on. I've attached an image from the 87015 and the 87002 object from the NWM files, would anyone be able to help me with this? I feel like I'm on the right track but not 100% sure what to do.

Simpliest one is just make duplicate of them with different states, and place them in [carX] you needed into.

Certainly, with the original round headlight, it was only lit with the reverser in Forward- I assume it was the same with the later square replacements.  So, markers on, headlight off when stationary.