Back in the fall of 2012 in the post Previously unnoticed track side detail I had mentioned the long row of concrete tiles that run along for miles next to some of the railroad tracks in Japan. In that post I had also speculated that these may be covered cable ditches for communications cables because I had noticed pipes connecting sensors and signals to these rows of tiles. At that time I had also identified a Kato set that had parts for building something similar. Recently I picked up a couple of these sets, Kato part number 23-227.
This was an easy and fun project, and added a nice touch to the Hot Springs Junction Ntrak right of way.