This is a roadblock which could be activated by a controled explosive.
It is located on a small uphill mountaintrail which leads to fort Fléron. Enemy tropos penetrating through the lines could be stalled for some time giving the garrison time to launch countermeasures.
When the explosive detonated, the block on top would slide over the rails, falling on the road and the roadblock was complete.
This is a rare kind of roadblock. Probably the last one who survived the war.
Why it survived can only be geusssed. Maybe the detonation failed, ore it just was not activated.
Afther all these years, the roadblock still excists.
Do you have more information about this location? Inform us!