Though the kulhads are made up of clay,which is an eco-friendly substance,their use has been discontinued in trains nowadays. Give reasons which lead to the discontinuance of this practice.

(N/A) Kulhads have been discontinued in trains nowadays because:
$1$. They are made up of the top layer of soil,which is the most fertile layer. Excessive use of kulhads would deplete this fertile layer,which is essential for agriculture.
$2$. Kulhads are neither recyclable nor reusable; therefore,their use was discontinued to prevent environmental degradation and resource depletion.