As I perceive standard trackwork terms regardless of gauge---
*tamping means packing cracked, non-rounded ballast rock under and around ties to lock track rigidly in place and permit quick moisture drainage, particularly at wooden ties.
*aligning means to nudge track into straight 'tangents', or smooth, proper arcs at desired curves.
*leveling is jacking or lowering rails and ties to eliminate short dips or rises...
*regulating means to 'dress' ballast level, usually to tie tops, using mechanical rotary brooms, and securely sloping ballast at tie ends to prevent undermining.
These days, whole track maintenance trains perform most of the formerly backbreaking, manual track repair/replacement, using lasers and loads of clever, mechanical elements.