The mouth of the legendary Sasaksaat railway tunnel. It's just forbidden to enter except for train officers. The distance is quite long, almost 1 km. That's how frequent trains pass by. To get to the mouth of this tunnel, you must first get permission from an officer who knows the train schedule. The train road is a bit curved.
Just found out I could get here after taking part in a Blind Ride with MTBCyclingTour Bandung... with Marshall Kang Ayung and Gan Agun. If you look at the information on the side of the Maswati-Sasaksaat tunnel, which is 950m long, it is in the Purwakarta area.