Race Comment Explainer

Original comment with matches highlighted:

raced keenly in last trio, pushed along and struggling turning in,

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
Keen	The horse was fighting the jockey, wasting energy early.

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
The horse was fighting the jockey, wasting energy early.