推測に過ぎませんので、参考になりますでしょうか？
hold time からの推測です。

ホームベース以外の終着駅で待つ時間
場合によってはそのための報酬

This is about the time that railway employees are required to spend at an “away from home terminal” until called upon for a turnaround service, etc.
(Please see the 3rd paragraph of the “GRIEVANCE RE ARTICLE 12 – HELD AWAY FROM HOME TERMINAL” below which explains the term.)

1.
[DOC]
AD HOC 528: CLAIM ARTICLE 12 HELD AWAY FROM HOME TERMINAL
File Format: Microsoft Word
Prior to April, 2002, calculations of time for the purposes of held away from home terminal payment was made continuously from the initial arrival at the ...
www.croa.com/SHPAWARDS/AH0528.doc

http://www.google.co.th/#hl=en&source=hp&biw=1280&bih=685&q=...

GRIEVANCE RE ARTICLE 12 – HELD AWAY FROM HOME TERMINAL
JOINT STATEMENT OF ISSUE:
Prior to April, 2002, calculations of time for the purposes of held away from home terminal payment was made continuously from the initial arrival at the away from home terminal until the final departure.
In this period between arrival and eventual departure, when crews at the away from home terminal were required to perform turnaround service, the time paid in that turnaround service was deducted from the continuous calculation of time being held at the away from home terminal.
After April, 2002, employees who were required to perform turnaround service at the away from home terminal had their held away from home terminal time calculated in two segments; first, from the time of the initial arrival at the away from home terminal until called for the turnaround service and second, from the time the turnaround service was complete until the next call to service.
The Union contends that the method of calculation made prior to April, 2002 is the correct means for employees who perform turnaround service from the away from home terminal.
The Union contends that the collective agreement language on its face, and the past practice of the parties supports its position.
The Company submits that the method of calculations made prior to April, 2002 for employees who perform turnaround service is inconsistent with the wording and intent of Article 12.