How do I parent sentries/dispensers to a func_tracktrain?

[Three Million]

I have a moving platform thats tied to a func_tracktrain, however Engies cant place any buildables on it like sentries, teleporters or dispensers. How can I make it so the area is buildable?

I have tried a trigger_multiple parented to the brush with filters for obj_dispenser, obj_sentrygun, and obj_teleporter. Then did OnStartTouch -> !activator -> SetParent -> platform_tracktrain but it doesnt work.

 

[Sonoma]

try turning the entity into a func_tanktrain instead

 

[Three Million]

try turning the entity into a func_tanktrain instead

Wow this was such an easy fix lol, I was thinking about it wayyy too hard