BS EN ISO 22074-7-2024 PDF

Full title and description

BS EN ISO 22074-7:2024 — Railway infrastructure. Rail fastening systems. Test method for clamping force and uplift stiffness. This British adoption reproduces the EN ISO text which is identical to ISO 22074-7:2021 and specifies a laboratory procedure to determine the clamping force exerted by a fastening system on the rail foot and, where required, the uplift stiffness of a complete fastening assembly.

Abstract

This standard defines the test setup, specimen preparation, loading and measurement procedures used to measure the force required to separate the rail foot from its immediate support (clamping force) and to determine the uplift stiffness of rail fastening systems. It applies to systems with and without baseplates and for surface-mounted and ballastless track elements; it does not apply to embedded rail systems or fastening systems that do not act on the rail foot.

General information

• Status: Published / Current (British adoption of EN ISO text).
• Publication date: 11 April 2024 (BS publication/adoption of EN ISO 22074-7:2024). Note: the EN/ISO text is derived from ISO 22074-7:2021.
• Publisher: BSI (as the British adoption of the EN/ISO document).
• ICS / categories: 45.080 – Rails and railway components.
• Edition / version: 2024 (BS adoption of EN ISO 22074-7:2024; identical to ISO 22074-7:2021).
• Number of pages: 16 pages (BS published PDF).

Scope

Specifies a laboratory test method to determine the clamping force exerted by a rail fastening system on the rail foot and, when required, to determine uplift stiffness of a complete fastening assembly. Applicable to systems with and without baseplates on all types of sleepers, bearers or ballastless track elements. Excludes embedded rail systems and fastening arrangements that do not act on the rail foot; the test does not assess the anchorage strength of components embedded in sleepers or other supporting elements.

Key topics and requirements

• Definition of specimen and test assembly (complete fastening assembly, rail short length, support arrangement).
• Test apparatus and mounting: clamps, loading fixtures, and instrumentation required to apply uplift/load and measure force and displacement.
• Measurement of clamping force: procedure to load until separation of rail foot from immediate support and record the separating force.
• Determination of uplift stiffness: method to compute stiffness from load–displacement behaviour when required by the test.
• Specified loading rates, repeatability, environmental/conditioning considerations, and required test reporting (results, specimen description, test setup).
• Scope limitations and exclusions (embedded rails, fastening systems not acting on the rail foot).

Typical use and users

Used by railway infrastructure owners, track design engineers, fastening-system manufacturers, independent testing laboratories, procurement teams and conformity assessment bodies to verify performance characteristics (clamping force and uplift stiffness) for product development, type testing, acceptance testing and technical specification compliance. Results support product selection, design verification and track-performance assessments.

Related standards

Part of the ISO 22074 series on rail fastening systems and related EN adoptions. Key related documents include: ISO 22074-1:2020 (Vocabulary), ISO 22074-2:2021 (Longitudinal rail restraint test), ISO 22074-3:2021 (Proof load / pull-out resistance), ISO 22074-4:2022 (Repeated loading), ISO 22074-5:2021 (Electrical resistance), ISO 22074-6:2021 (Resistance to severe environmental conditions). The EN/BS adoptions of the ISO parts (EN ISO 22074-x:2024) replace older EN 13146-series test-method documents.

Keywords

rail fastening systems, clamping force, uplift stiffness, test method, laboratory test, rail foot, baseplate, sleeper, ballastless track, ISO 22074, EN ISO, BS EN.

FAQ

Q: What is this standard?

A: BS EN ISO 22074-7:2024 is the British adoption of the EN ISO document that defines a laboratory test method to determine clamping force and uplift stiffness of rail fastening systems (identical in content to ISO 22074-7:2021).

Q: What does it cover?

A: It covers specimen preparation, apparatus, loading procedures and measurement/reporting rules to measure the force required to separate the rail foot from its immediate support and, when required, to quantify uplift stiffness for complete fastening assemblies. It applies to surface-mounted systems with or without baseplates and to ballastless track elements; it excludes embedded-rail arrangements.

Q: Who typically uses it?

A: Track engineers, fastening-system manufacturers, test laboratories, infrastructure owners, procurement and conformity assessors use the standard for development, type testing, acceptance testing and specification compliance.

Q: Is it current or superseded?

A: It is a current published British adoption (2024) of the EN ISO text; the ISO technical content dates from ISO 22074-7:2021. Where national implementations exist, check the national standards body for the definitive availability and status.

Q: Is it part of a series?

A: Yes — it is Part 7 of the ISO 22074 series on railway rail fastening systems; other parts address vocabulary, longitudinal restraint, pull-out resistance, repeated loading, electrical resistance and environmental resistance.

Q: What are the key keywords?

A: rail fastening, clamping force, uplift stiffness, test method, laboratory test, rail foot, baseplate, sleeper, ballastless track, ISO 22074.