They’re real. It’s a combination of them sagging/being broken and being reflected in the perfectly still water.

It’s revolutionary.

Preferably mid-combat

Indeed! For example, the Tōkaidō high speed line between Tokyo and Osaka runs almost 400 trains every day with an average delay of about 12 seconds 🤯

Bear in mind that this is just the high speed service (Shinkansen). There is also a parallel line for local trains.