It is sometimes called as Ditchers or Trenches, are similar to excavators
in the sense that penetrate the soil, break soil and rock, and from the earth. .
They differ from excavators in that the soil is removed in one continuous
movement. Digging trenches for pipes used specifically for, but other machines
have been improvised in the past in order to serve this purpose.
Trenches in construction
Trenchers can come in two types
  1. Ladder trenchers 
  2. Wheel

can dig trenches at speeds that other machines cannot compare