THAILANDSICThailand Standard Industrial Classification

TSIC Activity

42102

Construction of railways and subways

ประกอบกิจการรับเหมาติดตั้งอุปกรณ์จราจรทุกชนิด และเกี่ยวกับการวางทุ่น

What this activity covers

Companies in this sector focus on constructing and maintaining railways and underground railways.

  • Railway construction — Building railways and underground railways
  • Track laying — Graveling and laying railway tracks
  • Electrical installations — Installing electrical disconnecting and switching devices
  • Safety systems — Constructing railway control and safety systems
  • Elevated railways — Building elevated railways and cable car systems
  • Track improvement — Repairing and improving railway tracks

What companies here also do

Seen in real company registrations under this code — beyond the official definition, so licensing may differ.

  • Traffic equipment installation — Installing traffic equipment related to railways
  • Maintenance services — Providing maintenance for railways
  • High-speed train stations — Constructing high-speed train stations

Not included here

  • Architectural and engineering activities, see subgroup 7110
  • Project management related to civil engineering. See activity 71102.

Foreign ownership

List 3: Restricted, FBL/BOI route availableinherited from 42

Construction, except construction of infrastructure providing basic public services in public utilities or transport that requires special apparatus, machinery, technology or expertise, and except other categories prescribed in ministerial regulations

The infrastructure carve-out is subject to a minimum foreign capital requirement, subject to capital thresholds, verify current figures.

FBA B.E. 2542, List 3 (10)Routes: Foreign Business Licence, BOI promotion, US Treaty of Amity

Auto-mapped, verify against the Act. These TSIC mappings are indicative, not legal advice; the schedules of the Foreign Business Act B.E. 2542 are the authority. See the full foreign ownership reference.

Industry at a glance

as of 23 ก.ค. 69

The whole registered industry under this activity, every registration year, from the DBD DataWarehouse.

132
active companies operate here
฿1.9Bregistered capital, combined
฿48.4B
Sector revenue · 2025
+93% since 2023
฿1.8B
Net profit · 2025
62 profitable
202320242025

net profitrevenue

Foreign investment

new registrations · 2026 YTD
0%of new registered capital is foreign-held
฿0 foreign฿2.5M Thai

Based on few new registrations this year — read as a rough signal only.

New in 2026

3+0.0%

registrations, YTD

Registered capital

฿1.9B+2.4%

since year-end

Largest by revenue

Latest filed-year revenue, not a multi-year total

  1. 1AS-Ch. Thawee and Associates฿7.4B
  2. 2Joint Venture CKS-T-OR฿7.3B
  3. 3CKS-T DC2฿6.5B
  4. 4CKS-T PL฿5.7B
  5. 5Joint Venture ITD-Naowarat฿5.3B

Largest by registered capital

  1. 1Joint Venture TBT Co., Ltd.Buri Ram฿501.0M
  2. 2Tai PhipatChon Buri฿400.0M
  3. 3AI Engineering Services Co., Ltd.Bangkok฿200.0M

Source: Department of Business Development DataWarehouse. Financial figures are combined totals of companies that filed statements; revenue and profit shown for the latest three reporting years.

Companies registered since 2022

Browse all

New DBD registrations under this activity since 2022, the period the registry snapshot covers, not the full historical register.

19
Registered
since 2022
19
Still active
0
Dissolved
฿1.0M
Median capital
of active

New registrations per year

2022peak 5 in 20222026

Largest active companies by registered capital

Source: Department of Business Development (DBD) new-registration records, 2022 to present. Counts cover companies first registered in that window, reflect the latest snapshot load, and may lag the live register.

Emerhub

Restricted activity? There is usually a route.

Emerhub structures foreign-owned companies around FBA restrictions: Foreign Business Licence applications, BOI promotion, and compliant shareholding structures. Talk through your case before you commit to one.

Talk to Emerhub Thailand