Network Rail owns and operates the rail infrastructure in Great Britain.

Network Rail's infrastructure services private operators in two sectors:

• passenger services (commonly referred to as National Rail) and
• freight services

In a non-trailable set of points, the mechanism locks the points in position.  If a train trails through non-trailable points and the points are set in the incorrect position, the points will be forced to move and damage will occur to the points machine mechanisms.

In signalling, the attribute non-vital has a special meaning: Where incorrect operation or failure should not lead to personal injury or to damage of property or equipment.

Non-vital equipment includes train control and indication systems, etc.

Conversely, equipment with a vital attribute can cause injury or damage if they fail or are used incorrectly.

The National Training Framework (NTF) is a national system to ensure that when a VET provider is registered and the qualifications it offers are based on Training Packages or accredited courses the qualifications are recognised anywhere in Australia.

The NTF applies nationally, and is made up of:

• the Australian Quality Training Framework (AQTF)
• and Training Packages.

The NTF is a nationally consistent, industry-led system designed to:

• provide high-quality skill outcomes to maintain individuals' employability and increase their productivity,
• provide for nationally recognised qualifications,
• improve the competitiveness of enterprises and the nation.

One of DEST's roles is to develop, manage and promote national aspects of the NTF. State and territory training authorities administer the NTF.

An abbreviation for an Entrance and Exit control panel. The signaller operates a button on the control panel at the start of a route, and another button at the end of one (or more) routes. The panel will call for all signals and points within the route(s) to be set if the interlocking determines it is safe to do so.

Photos courtesy of Orient Express website

See "Catenary"

Overlap is a certain length of track, after a stop signal, that must not be occupied.  If a train fails to stop at a stop signal (e.g. brake failure or slippery tracks) the overlap provides enough distance to allow the train to comfortably stop. 

A pantograph is the articulated device that connects the electric-powered locomotive to the overhead power supply.

A passenger car (known as a coach or carriage in the UK) is a piece of rolling stock that is designed to carry passengers.