The edge rails are only for if you order panelised PCBs. The edge rails are not part of the PCB that you are designing:   You do however, have to note the minimum clearances between traces and the board edges (which depend on whether the PCBs are routed or V-cut): 

@andyfierman Ahhh that's what it is... I thought those were GND or Vcc traces. Thanks, Endy.

@andyfierman Until now, as long as I understood from all EasyEDA documentation and forum topics, position holes and fiducial marks are needed only for panelised boards which will be automatically assembled. Am I correct ? What about edge rails ? Are they a requirement for any panelised PCBs production, independently of their hereafter manual or automatic assembling? Thanks in advance,

@miggarc, Those are questions to ask as a new topic in the JLCPCB category.