Frequently asked questions

A Basic Asset Protection Agreement is an agreement between Network Rail and a third party carrying out works that could affect railway infrastructure. It sets out how Network Rail will review the works, who pays for that review, and the conditions the works must meet. It is used where the interface with the railway is limited; larger or higher-risk schemes generally need a full Asset Protection Agreement.

Both are asset protection agreements with Network Rail. A BAPA is the lighter-touch form used where the works are relatively simple and the risk to the operational railway is low. An APA is the fuller agreement used where the works are more complex or the risk is greater, and it normally involves more engineering review, more Network Rail staff time and more detailed conditions.

Generally when the works are close enough to Network Rail land or infrastructure that they could affect it. Common triggers include excavation near an embankment, cutting or retaining wall, piling, cranes and lifting operations near the line, scaffolding, demolition, drainage that discharges toward the railway, and anything that changes loading on railway earthworks. Distance alone does not decide it; the question is whether the works could credibly affect the railway, and Network Rail's asset protection team confirms whether an agreement is required.

CDM 2015 applies as it does to any construction project: the client appoints a principal designer and a principal contractor where more than one contractor is involved, and duty holders must plan, manage and monitor the work. Working next to an operational railway adds interface risks such as moving trains, overhead line equipment, conductor rails, restricted access and night working, and those need to be reflected in the design risk management and the construction phase plan.

As early as possible in the design, ideally at feasibility or pre-application stage. Asset protection conditions can influence the position of a building, the choice of foundation, crane locations, permitted working hours and the programme. Establishing those constraints after the design is fixed, or after planning permission is granted, often means redesign.

Broadly: what the works are, how close they come to railway assets, what could go wrong, and how that is controlled. Reviewers typically consider ground movement and its effect on earthworks and structures, loading and vibration, work near overhead line equipment or conductor rails, crane and lifting arrangements including any oversail of railway land, temporary works, drainage and surface water, method statements, and whether possessions or isolations are needed.

The third party promoting the works. Asset protection agreements are cost-recovery arrangements, so the developer or contractor funds Network Rail's review, supervision and any protective measures required. That cost is best allowed for in the project budget from the outset rather than treated as a later variation.

A glare assessment considers whether reflective surfaces such as glazing, cladding or solar panels, or new external lighting, could distract a train driver or make a signal harder to read. Network Rail may ask for one where a development overlooks the railway, particularly close to signals, and local planning authorities sometimes attach one as a planning condition.