Company lists · Data refreshed September 2026

Top 25 Line maintenance service providers based in the United Kingdom

Name: Line maintenance service providers based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 163 companies tracked

RevenueBase identified 163 line maintenance service providers headquartered in the United Kingdom as of September 2026 and tracks 4,352 professional contacts across them, including 1,877 with verified work emails. London is the largest hub.

This list covers line maintenance service providers headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 20, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 20, 2026 86% judged on-target in blind review

163Companies

4,352Contacts tracked

1,877Verified emails

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The 25 largest line maintenance service providers based in the United Kingdom

Ranked by team size

Top 25 of 163 line maintenance service providers based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to line maintenance service providers: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Volkerrail LTD	Indirect evidence	Doncaster, United KingdomHQ checked Sep 20, 2026	1,001-5,000	767 contacts →
	Indirect evidence “Since entering the construction market in 1935, VolkerRail has become one of the UK’s leading multidisciplinary railway infrastructure contractors.” Source: RevenueBase Database · checked Sep 20, 2026
2	QTS Group	Indirect evidence	Strathaven, United KingdomHQ checked Sep 20, 2026	501-1,000	486 contacts →
	Indirect evidence “QTS is one of the country’s leading railways contractors, founded by MD, Alan McLeish.” Source: RevenueBase Database · checked Sep 20, 2026
3	Quartzelec Limited	Indirect evidence	Rugby, United KingdomHQ checked Sep 20, 2026	501-1,000	412 contacts →
	Indirect evidence “Quartzelec is a leading independent electrical engineering group delivering solutions and services in both UK and global markets.” Source: RevenueBase Database · checked Sep 20, 2026
4	SPL Powerlines Uk&i	Indirect evidence	Coatbridge, United KingdomHQ checked Sep 20, 2026	501-1,000	337 contacts →
	Indirect evidence “SPL Powerlines UK & I is a leading multi-disciplinary infrastructure specialist, offering end-to-end delivery across both rail and energy sectors with capabilities that set us…” Source: RevenueBase Database · checked Sep 20, 2026
5	Cleshar	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	1,001-5,000	236 contacts →
	Indirect evidence “Cleshar delivers multidisciplinary services to the rail infrastructure sector.” Source: RevenueBase Database · checked Sep 20, 2026
6	RSS Infrastructure LTD	Indirect evidence	Birmingham, United KingdomHQ checked Sep 20, 2026	1,001-5,000	186 contacts →
	Indirect evidence “RSS Infrastructure (RSSI) is an award-winning multi-disciplinary service provider for the rail, construction and utilities sectors.” Source: RevenueBase Database · checked Sep 20, 2026
7	TES 2000 LTD	Indirect evidence	Colchester, United KingdomHQ checked Sep 20, 2026	201-500	142 contacts →
	Indirect evidence “TES Ltd is a long established, highly regarded contractor to the rail industry.” Source: RevenueBase Database · checked Sep 20, 2026
8	Excalon LTD	Indirect evidence	Salford, United KingdomHQ checked Sep 20, 2026	201-500	108 contacts →
	Indirect evidence “Excalon is one of the Britain’s leading UK Electrical Utility Service Providers.” Source: RevenueBase Database · checked Sep 20, 2026
9	AUS LTD	Indirect evidence	Clayton West, United KingdomHQ checked Sep 20, 2026	51-200	63 contacts →
	Indirect evidence “AUS is a specialist supplier to the electricity distribution and transmission, rail, utility arboricultural, and telecommunications industries.” Source: RevenueBase Database · checked Sep 20, 2026
10	The Crown Group	Indirect evidence	Crewe, United KingdomHQ checked Sep 20, 2026	51-200	56 contacts →
	Indirect evidence “The Crown Group is a highly skilled and highly respected business that offers a wide scope of environmental services within the rail, industrial and commercial sectors.” Source: RevenueBase Database · checked Sep 20, 2026
11	Sonic Rail Services LTD	Indirect evidence	Burnham-on-crouch, United KingdomHQ checked Sep 20, 2026	51-200	49 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
12	ECS Group Electrification Construction Services LTD	Indirect evidence	Crewe, United KingdomHQ checked Sep 20, 2026	51-200	45 contacts →
	Indirect evidence “Highly skilled teams delivering works throughout the UK.” Source: RevenueBase Database · checked Sep 20, 2026
13	Skelton Thomas Engineering LTD	Partial evidence	Neath, United KingdomHQ checked Sep 20, 2026	51-200	45 contacts →
	Partial evidence “We are proud to offer a complete maintenance package which incorporates all aspects of the company portfolio.” Source: RevenueBase Database · checked Sep 20, 2026
14	Lowery LTD	Indirect evidence	Staines Upon Thames, United KingdomHQ checked Sep 20, 2026	51-200	39 contacts →
	Indirect evidence “At Lowery we have a reputation for quality and service that goes back over 70 years, enabling us to offer our customers proven experience and knowledge.” Source: RevenueBase Database · checked Sep 20, 2026
15	Substation Engineering Services LTD	Partial evidence	Stafford, United KingdomHQ checked Sep 20, 2026	11-50	36 contacts →
	Partial evidence “Specialising in High Voltage Substation Installation & Commissioning, Site & Project Management, Refurbishment, Maintenance, SES Ltd has established a solid reputation for…” Source: RevenueBase Database · checked Sep 20, 2026
16	Allan J Hargreaves Plant Engineers LTD	Partial evidence	Thornton Cleveleys, United KingdomHQ checked Sep 20, 2026	51-200	33 contacts →
	Partial evidence “Allan J Hargreaves Plant Engineers was founded in August 1983 and incorporated in 2005 for the repair and maintenance of construction plant machinery, specialising in 360 degree…” Source: RevenueBase Database · checked Sep 20, 2026
17	Integrity	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 20, 2026	11-50	33 contacts →
	Indirect evidence “We enable safe, reliable operations and reduced outages for energy assets across the globe through our people, our expertise, and our commitment to deliver Integrated Service…” Source: RevenueBase Database · checked Sep 20, 2026
18	Cygnia Maintenance	Partial evidence	Broadstairs, United KingdomHQ checked Sep 20, 2026	51-200	33 contacts →
	Partial evidence “Cygnia is the UK's largest specialist signage maintenance company, currently servicing over retail and commercial premises from 30 strategically located centres.” Source: RevenueBase Database · checked Sep 20, 2026
19	Ncct Limited	Indirect evidence	Dartford, United KingdomHQ checked Sep 20, 2026	51-200	33 contacts →
	Indirect evidence “NCCT are a multi disciplined specialist contractor providing a fully integrated delivery solution for Electrical (HV & LV), Mechanical, Telecommunications and civils projects…” Source: RevenueBase Database · checked Sep 20, 2026
20	Fuse Rail LTD	Indirect evidence	Lyminge, United KingdomHQ checked Sep 20, 2026	51-200	31 contacts →
	Indirect evidence “Fuse Rail are a specialist electrical company created to service the Electrification and Plant requirements within the Rail industry.” Source: RevenueBase Database · checked Sep 20, 2026
21	Calibre BSL	Indirect evidence	Nutfield, United KingdomHQ checked Sep 20, 2026	51-200	30 contacts →
	Indirect evidence “With many years of extensive experience Calibre has been founded by four industry professionals brought together by a common goal; to provide our clients with a complete…” Source: RevenueBase Database · checked Sep 20, 2026
22	3eco LTD	Indirect evidence	Witney, United KingdomHQ checked Sep 20, 2026	11-50	28 contacts →
	Indirect evidence “3ECO Ltd is a consultancy firm that operates in the electrical and railway sectors.” Source: RevenueBase Database · checked Sep 20, 2026
23	Navitas Engineering LTD	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	27 contacts →
	Indirect evidence “Navitas Engineering provides electrical engineering consultancy services to the railway and electricity supply industries.” Source: RevenueBase Database · checked Sep 20, 2026
24	Dagem Power	Indirect evidence	Cannock, United KingdomHQ checked Sep 20, 2026	11-50	24 contacts →
	Indirect evidence “DAGEM Power are a dynamic and fast-growing SME at the forefront of bringing new renewable and nuclear energy projects online.” Source: RevenueBase Database · checked Sep 20, 2026
25	Industrial Maintenance Services LTD	Partial evidence	Portsmouth, United KingdomHQ checked Sep 20, 2026	51-200	24 contacts →
	Partial evidence “IMS specialise in the maintenance of production equipment and associated infrastructure.” Source: RevenueBase Database · checked Sep 20, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: line maintenance service providers. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names line maintenance service providers.
Partial evidence: Its own public description names part of line maintenance service providers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name line maintenance service providers. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 163 line maintenance service providers based in the United Kingdom

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Line maintenance service providers based in the United Kingdom at a glance

As of Sep 20, 2026

43.1%Verified-email coverage

26.7Average contacts per company

11-50Median size (employees)

10.4%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 163 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among line maintenance service providers, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United Kingdom whose own description of what they do matches “line maintenance service providers”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names line maintenance service providers), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among line maintenance service providers, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 1,877 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 20, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names line maintenance service providers, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many line maintenance service providers are there based in the United Kingdom?

RevenueBase identified 163 line maintenance service providers headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Volkerrail LTD, headquartered in Doncaster, tops this list with the largest team on record.

Which city has the most line maintenance service providers?

London leads with 17 headquartered companies, followed by Aberdeen (3) and Colchester (3).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 1,877 verified decision-maker contacts tracked across these 163 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 20, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.