A Functional Supply Point (FSP) is the equipment tasked with power distribution throughout the rail infrastructure. RSP’s range of products cover all installation requirements - from a legacy changeover of a single piece of switchgear to a full FSP equipment housing, offering multiple power supplies and auto reconfiguration facility.



RSP produce a range of FSP products in both class I and class II for use in signalling power distribution systems as defined in NR/L2/ELP/27410. The range conforms to NR/L2/SIGELP/27409 Issue 2.

RSP’s FSP01/02 switchgear assemblies is suitable for single and dual end fed systems with manual reconfiguration. Available in both 240v and 650v configurations.

The FSP 03 can be installed within duel end fed, auto reconfiguration systems and can be installed with all approved ARS systems currently in the market place. Switching can be provide for 110v through to 650v installations, both AC and DC.

The FSP04 range is designed specifically for SIN119 solutions to replace legacy installations. Supporting this is the range of TC04 Terminal Chambers which can be used for cable termination to support the whole FSP range.


RSP provides bespoke designs for each installation and conform to the signalling design handbook. These designs will be produced from client issued schematics and are individual to each contract.



All our products are built at our manufacturing facilities in Plymouth. Our manufacturing and test staff have a wealth of experience in this field and also hold IRSE licences appropriate to their role. This gives our clients peace of mind that we will deliver a high standard of workmanship and quality which is then verified by our in house testing team, who carry out full 3c testing of each product.


The RSP range offers a number of unique advantages to the industry and our customers.

We can install up to four 1500Va transformers or up to four 10a T/Js within a single FSP. Alternatively we could provide an FSP that houses a 25Ah point battery system, inclusive of charger. Feeder cables up to 120mm2 in both copper and aluminium can also be installed easily, using our sliding gland plates.


All products come with a standard 12 month warranty with an option to extend if required and a minimum 35 year life expectancy. RSP has an experienced team on hand to provide ongoing support pre, during and after sales.


For more information about these components, please send an email to enquiries@rsprail.co.uk or use the form below.

Product contact

RSP Rail love a challenge. If you have a complex project, work package or need Network Rail approved products, give us a call on 01752 969321 or email enquiries@rsprail.co.uk