Individual Working Alone (IWA) Flashcards

What does IWA stand for in the context of railway track safety?

Answer: Individual Working Alone

IWA stands for Individual Working Alone. It is a Safe System of Work that allows a single competent and authorised person to work on or near the line without requiring a separate COSS or lookout, provided specific conditions relating to line speeds, work type, and competency are met.

Which of the following is a key condition that must be met for an IWA Safe System of Work to be used?

Answer: The line speed must not exceed a specified maximum and the work must be of a type permitted under IWA rules

IWA working is only permitted on lines up to a defined maximum speed (typically 50 mph or lower, depending on the specific rules in force) and only for tasks that fall within the scope of approved IWA work. The individual must also hold the relevant IWA competency on Sentinel.

When working under IWA, who is responsible for providing warning of approaching trains?

Answer: The IWA worker themselves, using their own observation and any applicable warning system

Under an IWA system, the individual worker takes personal responsibility for monitoring for approaching trains and reaching a position of safety. There is no separate lookout — this is the defining difference from other safe systems. This is why IWA is restricted to lower-speed lines and limited task types.

An IWA is only permitted on lines where the maximum permissible speed does not exceed:

Answer: 50 mph

IWA is restricted to lines with a maximum permissible speed of 50 mph or less. At higher speeds, the time available for a lone worker to identify an approaching train and reach safety is insufficient without a dedicated lookout or COSS protection.

How does an IWA differ from a COSS-controlled safe system of work?

Answer: Under IWA there is no separate COSS or lookout — a single competent person manages their own protection

The fundamental difference is that an IWA is a single-person system with no COSS, lookout, or warning team. The individual must be competent and Sentinel-registered for IWA. A COSS-controlled system involves a COSS responsible for a team or work group, often with lookouts and a defined warning arrangement.

Which type of work would NOT normally be permitted under an IWA Safe System of Work?

Answer: A large team of workers laying new ballast on a 100 mph main line

IWA is restricted to individual workers and lines not exceeding 50 mph. A large team on a 100 mph main line requires a full COSS-controlled safe system of work, potentially with a possession. IWA would be entirely inappropriate for both the team size and the line speed involved.