What are the requirements of rail in a railway track?

A steel rail is a mechanical component whose geometry, material properties, and surface condition collectively define the track's operational limits, including allowable speed, load, and service frequency. Accurate rail selection and manufacturing reduce maintenance needs and improve safety. GNEE RAIL supplies rails in all recognized global standards and profiles, provides tailored lengths, precision machining, rail straightening, environmental adaptation, fastener and pad matching, and long-term technical support to ensure a complete track system solution.

 

What are the requirements of rail in a railway track?

 

Railway rail requirements focus on strength, durability, and precise geometry to safely guide trains, needing high resistance to impact/wear (strength), proper profile for wheel contact, smooth alignment (gauge, levels, superelevation), thermal expansion management (gaps), and material quality (steel composition/hardness) for safety, stability, and longevity under heavy dynamic loads.

 

Key Requirements & Functions

 

 

• Strength & Toughness: Must withstand immense vertical wheel loads and lateral forces, resisting bending, fatigue, and wear from impacts.

 

• Wear Resistance: Sufficient hardness and thickness to manage constant abrasion from wheels, preventing rapid degradation.

 

• Friction & Contact Surface: The head needs adequate roughness for traction but not so much that it creates excessive resistance; the width must accommodate wheel flanges.

 

Geometric Precision:

 

• Gauge: Uniform and correct distance between rails.

 

• Levels & Alignment: Smooth, straight runs on tangents and correctly superelevated (sloped) curves to counter centrifugal force.

 

 

• Dimensional Tolerances: Strict limits on straightness, bending, and torsion.

 

• Material Properties: High-quality steel with controlled chemical composition and internal structure for superior hardness and fracture toughness (e.g., bainitic steels).

 

Common Rail Steel Grades Worldwide:

 

 

Grade	Standard / Region	Typical Composition (wt%)
R260	EN 13674-1 (Europe)	C: 0.67–0.80, Mn: 0.90–1.20, Si: ≤0.50
R350HT	EN 13674-1 (Europe)	C: 0.75–0.85, Mn: 0.80–1.20, Cr: 0.20–0.50
Grade 260	AREMA (North America)	C: ~0.77, Mn: ~1.0–1.2, Si: ~0.2
Grade 350	AREMA + Mill Specs (USA/Canada)	C: 0.78–0.83, Mn: 0.90–1.20, Cr: 0.2–0.6, + V/Nb (microalloyed)
BH Rail (Bainitic)	JIS E 1101 (Japan), adopted in EU/India	C: 0.65–0.80, Mn: 1.0–1.4, Cr/Mo/Ni (optional, mill-specific)
U71Mn	GB/T 2585 (China)	C: 0.65–0.77, Mn: 1.10–1.40, Si: 0.15–0.35
U75V	GB/T 2585 (China)	C: 0.67–0.77, Mn: 0.70–1.00, V: 0.04–0.12

 

• Thermal Management: Need for expansion gaps or continuous welded rail (CWR) to handle temperature changes, preventing buckling in heat or pulling apart in cold.

 

• Structural Integrity: Sufficient rail depth and profile (like an I-beam) to distribute loads effectively and ensure stability.

 

Steel Rail Types

 

The type of rail is classified by kilograms per meter of rail length. For example, steel rails used in China's railways are 75kg/m, 60kg/m, 50kg/m, 43kg/m and 38kg/m.

 

 

• Classified by Application: GNEE RAIL supplies crane rail( QU120,QU100,QU80,QU70), heavy rail( 38, 43, 50, 60, 75kg) and light rail( 9,12,15,22,30kg/m).

 

 

Classification		Height(mm)	Head (mm)	Bottom (mm)	Thick(mm)	Weight (kg/m)
Light Rail	8 KG/M	65	25	54	7	8.42
	9 KG/M	63.5	32.1	63.5	5.9	8.94
	12 KG/M	69.85	38.1	69.85	7.54	12.2
	15 KG/M	79.37	42.86	79.37	8.33	15.2
	18 KG/M	80	40	80	10	18.06
	22 KG/M	93.66	50.8	93.66	10.72	22.3
	24 KG/M	107	51	90	10.9	24.46
	30 KG/M	107.95	60.33	107.95	12.3	30.1
Heavy Rail	38 KG/M	134	68	114	13	38.733
	43 KG/M	140	70	114	14.5	44.653
	45 KG/M	145	67	126	14.5	45.546
	50 KG/M	152	70	132	15.5	51.514
	60 KG/M	176	73	150	16.5	60.64
Crane Rail	QU 70	120	70	120	28	52.8
	QU 80	130	80	130	32	63.69
	QU 100	150	100	150	38	88.96
	QU 120	170	120	170	44	118.1

 

• Stee rail in foreign standards: British Standard: BS series (90A, 80A, 75A, 75R, 60A, etc.) German standard: DIN series crane rails. International Railway Union: UIC series. American Standard: ASCE series. Japanese standard: JIS series.

 

As as professional rail fastener supplier, GNEE RAIL can provide different standard steel rail such as GB,American, BS, UIC, DIN, JIS, Australian and South Africa which used in railway lines, cranes and coal mining.

 

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