SIC code 42120
Construction of railways and underground railways
2,922 UK companies classified under this code.
Search companies with SIC 42120What SIC code 42120 covers
SIC code 42120 is the UK Standard Industrial Classification for Construction of railways and underground railways. It falls under SIC section F — Construction, division 42. Companies record it at Companies House to describe what they do, and it is one of up to four SIC codes a company can hold.
Construction of railways and underground railways — the contractors laying track, signalling and station infrastructure for the heavy-rail and metro networks. This is large-scale, specialist civils work dominated by major Network Rail and transit contractors and their tier-two suppliers, sitting close to road, bridge and tunnel construction.
Where these companies are based
Active companies under SIC code 42120 cluster most in:
- London 580
- Birmingham 47
- Doncaster 41
- Sidcup 41
- Romford 39
- Ashford 38
Example companies with SIC code 42120
A sample of recently-incorporated active companies classified under 42120:
- Teksun Ltd
- Alpha Dez Ltd
- Larkin Rail Group Ltd
- Kls Services Ltd
- Jcdn Ltd
- Leco Rail Ltd
- Barricus Ltd
- Railway Engineering Ltd
- Neoeng-01 Ltd
- Gen-Ix Ltd
- Modus Infrastructure Group Ltd
- Igmg Limited
Related SIC codes
- 42110 Construction of roads and motorways
- 42130 Construction of bridges and tunnels
- 42210 Construction of utility projects for fluids
- 42220 Construction of utility projects for electricity and telecommunications
- 42910 Construction of water projects
- 42990 Construction of other civil engineering projects n.e.c.
Frequently asked
What is SIC code 42120?
SIC code 42120 is the UK Standard Industrial Classification (SIC 2007) for "Construction of railways and underground railways". It is the code a company records at Companies House when this is its business activity, and it sits within SIC section F — Construction.
How many companies use SIC code 42120?
2,922 companies are currently classified under SIC code 42120 on the UK register, most commonly in London, Birmingham, Doncaster.
How do I find companies with SIC code 42120?
On Company Shark, search the live Companies House register by SIC code 42120, then narrow by location and incorporation date and export the list with director details. SIC code filtering is available on the Business and MAX plans.
Is SIC code 42120 the right code for my company?
SIC codes are self-reported. Pick the code that most closely matches your main activity — 42120 covers "Construction of railways and underground railways". You can record up to four SIC codes, and update them on your annual confirmation statement.
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