Race Comment Explainer

Original comment with matches highlighted:

tracked leaders, st position over 3f out, lost position when over 2f out,

Matched phrases & meanings

Phrase	Meaning
Tracked leader	Followed closely behind the leaders.
Pushed along	The jockey started to urge the horse (hand-riding, not necessarily using the whip).
tailed off	A definitive statement that the horse was finished and effectively out of the race
Outpaced	Could not keep up with faster horses mid-race.

Summary

Followed closely behind the leaders.
The jockey started to urge the horse (hand-riding, not necessarily using the whip).
A definitive statement that the horse was finished and effectively out of the race
Could not keep up with faster horses mid-race.