Race Comment Explainer

Original comment with matches highlighted:

slowly away, in rear, soon headway on outside, pushed along and over 1f out

Matched phrases & meanings

Phrase	Meaning
Pushed along	The jockey started to urge the horse (hand-riding, not necessarily using the whip).
Weakened	The horse lost speed and dropped back through the field.
Headway	The horse was moving up through the field.
Rear	Running near the back of the field.

Summary

The jockey started to urge the horse (hand-riding, not necessarily using the whip).
The horse lost speed and dropped back through the field.
The horse was moving up through the field.
Running near the back of the field.