RAILROAD trains should never have accidents—let alone collide—if all the systems are working properly. This cheap and cheerful mode of transport runs on rails, so it cannot turn left or right as it pleases because the track does not turn. So why are there still accidents, even collisions, like the one that happened at Petarukan Station, Pemalang, Central Java two weeks ago?

There are three things that need to be considered. The condition of