Introduction
Two rails can weigh within a kilogram of each other per metre and still be incompatible in every way that matters. A 115RE section and a 54E1 section sit three kilograms apart on paper, and share no clip, no baseplate, no weld mould and no fishplate. Buyers get caught by this constantly, because mass per metre is the number on the purchase order and geometry is the number that decides whether anything fits. This guide covers what a rail profile is, the main types and standards, how the common sections compare, and the factors that should actually drive your selection.
What Is a Rail Profile?
A rail profile is the cross-sectional shape of the rail. It defines head width and crown radius, web thickness, foot width and thickness, overall height, and the fillet radii joining them.
Everything that touches the rail is designed around that shape. Fastening clips grip the foot. Baseplates and pads seat under it. Fishplates fit the web fillets. Welding moulds match the outline exactly. Change the profile and you change the entire component family.
The Three Zones — Head, Web, Foot
- Head — carries the wheel. Its width and crown radius set contact stress and wear behaviour.
- Web — carries shear and connects head to foot. Its thickness governs fatigue life around bolt holes and fishplate contact.
- Foot — transfers load to the sleeper and gives the clip something to hold. Its width sets bearing area and lateral stability.
Types of Rail Profiles
Flat Bottom (Vignoles) Rail
The dominant profile worldwide, introduced to Britain by Charles Vignoles in 1836. A wide flat foot sits directly on a baseplate or pad and is held by clips. It is self-supporting, easy to fasten, and easy to weld. Almost all main-line, freight and metro track uses it.
Bullhead Rail
An asymmetric profile where head and foot differ, seated in cast iron chairs with wooden keys. Standard in Britain until the mid-twentieth century. It survives in heritage and some legacy urban track. It needs chairs, and chairs need maintenance, which is why it lost.
Grooved Rail
Used where rail is embedded in a road surface — trams and light rail. The profile includes a flangeway groove alongside the running surface, so wheels have somewhere for the flange to run while the road stays flush.
Crane Rail
Short, stocky sections with a very wide head, built for concentrated static and rolling loads from gantry and overhead cranes. Covered by DIN 536 A-series and GB QU-series. Not interchangeable with running rail despite superficial similarity.
Light Rail and Special Sections
Lighter sections for sidings, industrial yards, mining and material handling. Also asymmetric sections rolled specifically for switch blades, where the web is thickened so the blade keeps stiffness after the head is machined away.
Rail Profile Standards
UIC and EN 13674
The European family. Sections are named by mass and a code — 60E1, 54E1, 50E6. The older UIC 60 and UIC 54 names still circulate and are close but not always identical to their EN successors. EN 13674 covers dimensions, steel grades and acceptance testing.
AREMA
The North American family. Sections are named by weight in pounds per yard plus a design suffix: 115RE, 132RE, 136RE. Higher numbers mean heavier and taller sections for heavier axle loads.
DIN and GB
DIN covers both standard rails (through EN 13674) and crane rails under DIN 536. GB is the Chinese national standard, with P-series running rails under GB/T 2585 and QU-series crane rails.
Indian Railways (IRS)
Indian Railways works principally with 52 kg and 60 kg sections under IRS specifications, with 60 kg now standard on main routes and 52 kg widespread on secondary lines. Steel grades follow 880 and 1080 head-hardened designations.
Common Rail Sections Compared
| Section | Height | Head width | Base width | Mass |
| 60E1 (UIC 60) | 172.0 mm | 72 mm | 150.0 mm | 60.21 kg/m |
| 54E1 (UIC 54) | 159.0 mm | 70 mm | 140.0 mm | 54.77 kg/m |
| 115RE | 168.3 mm | 69.1 mm | 139.7 mm | 57.0 kg/m |
| 136RE | 185.7 mm | — | 152.4 mm | 67.5 kg/m |
| IRS 52 kg | 156 mm | 67 mm | 136 mm | 51.89 kg/m |
Read across the 54E1 and 115RE rows. Mass differs by about 2 kg/m. Height differs by 9 mm and base width by less than a millimetre. They look adjacent and behave as entirely separate component families.
Why Equal Weight Does Not Mean Equal Rail
This is the expensive mistake, and it is worth stating flatly: similar mass per metre does not guarantee interchangeability.
What breaks when you assume it does:
- Rail clips are designed for a specific foot thickness and toe geometry
- Baseplates and sole plates are machined for a specific foot width and height
- Fishplates fit specific web fillet radii and bolt hole positions
- Aluminothermic weld moulds match one profile outline only
- Turnout components — switch blades, crossings, check rails — are all profile-specific
- Grinding patterns and profiles are written for a named section
A single incompatible section in a corridor creates a permanent transition point. Every transition is a joint, and every joint is a maintenance location for the life of the track.
Rail Steel Grades: A Separate Decision
Profile and grade are independent choices, and people conflate them.
- Standard carbon grades (R260, IRS 880) — general main-line use, good weldability, moderate wear resistance
- Head-hardened grades (R350HT, IRS 1080 HH) — heat-treated running surface for sharp curves, heavy haul and high-tonnage routes
- Bainitic and premium grades — used selectively where rolling contact fatigue dominates
The rule of thumb: profile is chosen for load and geometry, grade is chosen for wear and fatigue. A heavier section will not fix a curve wearing out from RCF. A harder grade will.
Rail Profile Selection Factors
- Axle load and annual tonnage. These set the minimum section. Heavier axle loads need a taller rail with more section modulus.
- Design speed. Higher speeds favour heavier sections for stiffness and reduced deflection.
- Curve radius. Sharp curves push you toward head-hardened grades and, often, a heavier section on the high rail.
- Existing network standard. The strongest constraint in practice. Matching what the corridor already uses avoids a permanent transition.
- Sleeper type and spacing. Foot width must match available baseplate and fastening designs.
- Availability and lead time. A theoretically optimal section you cannot source in your region is not optimal.
- Turnout compatibility. Confirm your chosen section has an established turnout family before committing.
Transverse Profile vs Rail Section
One more distinction that causes confusion. The rail section is what you buy. The transverse profile is the shape of the rail head as maintained in service by grinding.
Grinding targets a designed head shape for each curve radius and traffic mix. Over time the ground profile can drift a long way from the as-rolled section while the rail is still perfectly serviceable. When someone says “we ground the rails to profile,” they mean the head shape, not the section.
FAQs
What does 60E1 mean? It is the EN 13674 designation for a 60 kg per metre flat bottom rail, first variant. The number before the E is nominal mass per metre; the code after identifies the specific geometry.
Is UIC 60 the same as 60E1? They are very close and often treated as equivalent in commerce, but the designations come from different standard generations. For fastenings and welding, always work from the specific standard your rail is certified to.
Can I mix rail sections on the same track? Only through a designed transition — a compromise fishplate or a transition weld. Every transition is a permanent maintenance location, so mixing sections is something to design around, not into.
Which rail profile is most common? Flat bottom, by a wide margin. It is the standard for main line, freight, metro and high-speed track worldwide.
Does a heavier rail always last longer? Not necessarily. A heavier section resists bending and deflection better, but wear and rolling contact fatigue are governed by steel grade, contact geometry and lubrication. Heavier rail in the wrong grade will still shell on a sharp curve.
Conclusion
Pick the section from axle load, speed and what your corridor already runs. Pick the grade from curve radius and tonnage. Then check that clips, baseplates, fishplates, weld moulds and turnout components all exist for the section you chose. The rail is the cheap part of that decision; everything bolted to it is where the money goes.
Rolled Sections and Track Components From Jekay International
Jekay International has manufactured railway track components since 1980, supplying railway developers and government bodies across Asia, Africa, Europe and the Americas. Alongside our own rolling mills producing angles, channels, beams and light rail profiles, we manufacture the components that have to match your section exactly — turnout systems, switches, crossings, expansion joints, fish plates, base plates, elastic fastenings, rail pads and insulated rail joints.
Because we roll, forge, cast and machine in-house, we build the whole component family to one specified profile instead of assembling it from whatever fits.
Tell us your rail section and standard, and our engineering team will confirm the matching component range and lead times. Contact Jekay International for a quotation.
