Race Comment Explainer

Original comment with matches highlighted:

in rear, pushed along before 5th, ing 6th, and detached approaching 6th, after 3 out

Matched phrases & meanings

Phrase	Meaning
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.
Rear	Running near the back of the field.

Summary

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.
Running near the back of the field.