The best replacement for railing is half wall.

The best alternatives to railing are rated as following:
★★★★★  half wall
★★★★  banister
★★★  parachuting
★★  wrought iron
★★  aluminum railing
★  composite railing
★  phoenix deck railing
★  steel railing
  vinyl railing

Your alternative for railing is not listed? Suggest!
Speaking about railing, one probably shouldn't forget about gate.

Other search terms related to railing and their ratings are:

★★★★★ gate
★★ half wall
You have in mind a companion for railing and it is not yet here? Propose!

Google Trends

Scale is based on the average worldwide traffic of railing in all years. Click on graph for more.
half wall