Company lists · Data refreshed September 2026

Top 25 Transit authority engineering services worldwide

Name: Transit authority engineering services worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 13,272 companies tracked

RevenueBase identified 13,272 transit authority engineering services worldwide as of September 2026 and tracks 699,842 professional contacts across them, including 244,754 with verified work emails and 0 with mobile numbers. The United States is the largest market and Sao Paulo the largest hub.

This list covers transit authority engineering services worldwide, 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 19, 2026. Country and city lists for transit authority engineering services follow the table.

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 19, 2026 86% judged on-target in blind review

13,272Companies

699,842Contacts tracked

244,754Verified emails

0Mobile numbers

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The 25 largest transit authority engineering services worldwide

Ranked by team size

Top 25 of 13,272 transit authority engineering services worldwide, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to transit authority engineering services: 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	AECOM	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 19, 2026	10001+	63,914 contacts →
	Indirect evidence “AECOM is the global infrastructure leader, committed to delivering a better world.” Source: RevenueBase Database · checked Sep 19, 2026
2	Stantec	Indirect evidence	Edmonton, AB, CanadaHQ checked Sep 19, 2026	10001+	28,416 contacts →
	Indirect evidence “Stantec empowers clients, people, and communities to rise to the world’s greatest challenges at a time when the world faces more unprecedented concerns than ever before.” Source: RevenueBase Database · checked Sep 19, 2026
3	Atkinsréalis	Partial evidence	Montreal, QC, CanadaHQ checked Sep 19, 2026	10001+	22,733 contacts →
	Partial evidence “We are a world-class engineering services and nuclear organization.” Source: RevenueBase Database · checked Sep 19, 2026
4	Tetra Tech	Partial evidence	Pasadena, CA, United StatesHQ checked Sep 19, 2026	10001+	12,999 contacts →
	Partial evidence “Tetra Tech is the leader in water, environment and sustainable infrastructure, providing high-end technical and engineering services for projects worldwide.” Source: RevenueBase Database · checked Sep 19, 2026
5	EGIS	Partial evidence	Saint-quentin-en-yvelines, FranceHQ checked Sep 19, 2026	10001+	11,641 contacts →
	Partial evidence “Egis is a leading global architectural, consulting, construction engineering, operations and mobility services firm.” Source: RevenueBase Database · checked Sep 19, 2026
6	WSP In Canada	Partial evidence	Montreal, QC, CanadaHQ checked Sep 19, 2026	10001+	10,015 contacts →
	Partial evidence “We are one of the world’s leading professional services firms, uniting our engineering, advisory and science-based expertise to shape communities to advance humanity.” Source: RevenueBase Database · checked Sep 19, 2026
7	Atkins	Indirect evidence	Epsom, United KingdomHQ checked Sep 19, 2026	10001+	9,297 contacts →
	Indirect evidence “Atkins is now AtkinsRéalis.” Source: RevenueBase Database · checked Sep 19, 2026
8	Tata Consulting Engineers	Partial evidence	Mumbai, IndiaHQ checked Sep 19, 2026	5,001-10,000	8,440 contacts →
	Partial evidence “Tata Consulting Engineers Limited (TCE) is the largest Indian private sector engineering and project consultancy and an emerging global leader in integrated engineering solutions.” Source: RevenueBase Database · checked Sep 19, 2026
9	URS Corporation, An Aecom Company	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 19, 2026	10001+	7,706 contacts →
	Indirect evidence “URS Corporation operations are now affiliated with AECOM.” Source: RevenueBase Database · checked Sep 19, 2026
10	CDM Smith	Partial evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	5,001-10,000	7,527 contacts →
	Partial evidence “CDM Smith is shaping what’s next, now, with world class solutions in water, environment, transportation and energy to public and private clients worldwide.” Source: RevenueBase Database · checked Sep 19, 2026
11	HNTB	Indirect evidence	Kansas City, MO, United StatesHQ checked Sep 19, 2026	5,001-10,000	7,469 contacts →
	Indirect evidence “For over a century, HNTB has shaped the built environment with distinctive expertise across a full spectrum of infrastructure solutions.” Source: RevenueBase Database · checked Sep 19, 2026
12	UGL	Partial evidence	North Sydney, AustraliaHQ checked Sep 19, 2026	5,001-10,000	5,965 contacts →
	Partial evidence “UGL is CIMIC Group's specialist end-to-end engineering, services and operations provider.” Source: RevenueBase Database · checked Sep 19, 2026
13	SMEC	Partial evidence	North Sydney, AustraliaHQ checked Sep 19, 2026	5,001-10,000	5,231 contacts →
	Partial evidence “SMEC is a global engineering, management and development consultancy with a 70-year history of delivering advanced solutions on a global scale across urban development…” Source: RevenueBase Database · checked Sep 19, 2026
14	Systra	Strong evidence	Paris, FranceHQ checked Sep 19, 2026	10001+	5,069 contacts →
	Strong evidence “SYSTRA is one of the world's leading engineering and consultancy groups specialising in public transport and mobility solutions.” Source: RevenueBase Database · checked Sep 19, 2026
15	INECO	Partial evidence	Madrid, SpainHQ checked Sep 19, 2026	5,001-10,000	4,669 contacts →
	Partial evidence “Ingeniería y consultoría de referencia en el ámbito de la movilidad sostenible y la transformación digital Englobada dentro del grupo del Ministerio de Transportes y Movilidad…” Source: RevenueBase Database · checked Sep 19, 2026
16	Artelia	Partial evidence	Saint-ouen, FranceHQ checked Sep 19, 2026	5,001-10,000	4,612 contacts →
	Partial evidence “Artelia is an international multidisciplinary consultancy, engineering and project management group specialising in mobility, water, energy, building and industry.” Source: RevenueBase Database · checked Sep 19, 2026
17	Michael Baker International	Partial evidence	Pittsburgh, PA, United StatesHQ checked Sep 19, 2026	5,001-10,000	4,362 contacts →
	Partial evidence “Michael Baker International is a leading provider of engineering, consulting, and technology services spanning four Verticals: Infrastructure, Places and Facilities, Federal and…” Source: RevenueBase Database · checked Sep 19, 2026
18	ICA Ingenieros Civiles Asociados	Indirect evidence	MexicoHQ checked Sep 19, 2026	10001+	3,752 contacts →
	Indirect evidence “Somos una empresa mexicana con 68 años de experiencia en brindar soluciones integrales a retos complejos de infraestructura.” Source: RevenueBase Database · checked Sep 19, 2026
19	STV	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 2026	1,001-5,000	3,556 contacts →
	Indirect evidence “STV offers professional services for the infrastructure that powers our lives.” Source: RevenueBase Database · checked Sep 19, 2026
20	Norconsult	Partial evidence	Sandvika, NorwayHQ checked Sep 19, 2026	5,001-10,000	3,555 contacts →
	Partial evidence “Norconsult is a multidisciplinary engineering and design consultancy, providing services to clients in the public and private sectors worldwide.” Source: RevenueBase Database · checked Sep 19, 2026
21	National Engineering Services Pakistan PVT Limited Nespak	Indirect evidence	Lahore, PakistanHQ checked Sep 19, 2026	5,001-10,000	3,266 contacts →
	Indirect evidence “NESPAK is Pakistan’s premier consultancy organization (established in 1973).” Source: RevenueBase Database · checked Sep 19, 2026
22	TYLIN	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 19, 2026	1,001-5,000	3,067 contacts →
	Partial evidence “As a global engineering firm, we design infrastructure solutions that connect and elevate communities.” Source: RevenueBase Database · checked Sep 19, 2026
23	KEO International Consultants	Indirect evidence	Safat, KuwaitHQ checked Sep 19, 2026	1,001-5,000	3,038 contacts →
	Indirect evidence “From shaping iconic skylines to crafting sustainable communities, KEO builds legacies for a better tomorrow.” Source: RevenueBase Database · checked Sep 19, 2026
24	Ratp DEV	Partial evidence	Paris, FranceHQ checked Sep 19, 2026	10001+	2,958 contacts →
	Partial evidence “RATP Dev is a subsidiary of the RATP Group, global leader in high-capacity urban rail and the world's third largest public transport operator.” Source: RevenueBase Database · checked Sep 19, 2026
25	Yapı Merkezi	Indirect evidence	TürkiyeHQ checked Sep 19, 2026	10001+	2,852 contacts →
	Indirect evidence “Yapı Merkezi, founded in 1965, aims "to create and to realize construction projects that will serve humanity by creating environments of happiness".” Source: RevenueBase Database · checked Sep 19, 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: transit authority engineering services. 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 transit authority engineering services.
Partial evidence: Its own public description names part of transit authority engineering services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name transit authority engineering services. 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 13,272 transit authority engineering services worldwide

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Transit authority engineering services worldwide at a glance

As of Sep 19, 2026

35.0%Verified-email coverage

52.7Average contacts per company

11-50Median size (employees)

1.4%Largest-city concentration · Sao Paulo

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

5,900

11-50

4,454

51-200

1,854

201-500

571

501-1,000

208

1,001-5,000

181

5,001-10,000

10001+

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 transit authority engineering services, 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.
Coverage: 44 countries, largest first: the United States, Brazil, India, Germany, Italy, France, Australia, the United Kingdom, Canada, Spain and 34 more. Country and city lists for transit authority engineering services are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “transit authority engineering services”. 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 transit authority engineering services), 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 transit authority engineering services, and records with no verified work email.
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, 244,754 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 19, 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.

Transit authority engineering services by location

76 lists · largest first

Every Transit authority engineering services list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 transit authority engineering services, 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 transit authority engineering services are there worldwide?

RevenueBase identified 13,272 transit authority engineering services worldwide 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?

AECOM, headquartered in Dallas, tops this list with the largest team on record.

Which country has the most transit authority engineering services?

The United States leads with 2,888 companies, followed by Brazil (1,167) and India (822). Every transit authority engineering services list by country and city is linked on this page.

Which city has the most transit authority engineering services?

Sao Paulo leads with 192 headquartered companies, followed by London (140) and Riyadh (114).

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 244,754 verified decision-maker contacts tracked across these 13,272 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 19, 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.