just thinking with the introduction of cliffs it would be handy if the train would auto destroy cliffs in its path , as long as you have cliff explosives of course

Agree. This would be a good addition.

+

don't know if its in new in 0.17 but cliffs can be removed by bots (or at least with personal bots if you have cliff explosives in the bag)
maybe there is an extended API

Version: 3.1.0
Date: 19. 03. 2019
Changes:
- added option to remove cliffs, requires cliff explosives (defaults to true)

This appears to have a bug in 0.17.48 at least: Out of Unknown key: "entity-name.cliff-explosives"

Ack, no, it's just me being an idiot; I forgot that FARL doesn't take from my inventory, just the cars.