The best replacement for monorail is light rail.

The best alternatives to monorail are rated as following:
★★★★★  light rail
★★★★  metro
★★★  asp.net mvc
★★  field camera
★★  over the wire
★★  metro rail
★★  track lighting
★★  maglev
★★  light rail cost
★  crossmark
★  lrt
★  ferry
★  metro train
★  metrorail
★  mrt
  deuce
  skybus
  otw

Your alternative for monorail is not listed? Suggest!
Speaking about monorail, one probably shouldn't forget about electric hoist.

Other search terms related to monorail and their ratings are:
★★★★★ electric hoist
★★★ chain pulley block
You have in mind a companion for monorail and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of monorail in all years. Click on graph for more.
monorail
light rail
metro