What are the differences between heavy rails and light rails

Sep 29, 2025

Heavy rail and light rail exhibit distinct differences in railway engineering, primarily reflected in cross-sectional dimensions, load-bearing capacity, applicable scenarios, and service life.

track rail

Heavy rail typically refers to rails with a mass per unit length of 30 kg/m and above, such as GB 50 kg/m, GB 60 kg/m, GB 75 kg/m, or UIC60 rails. Light rail, on the other hand, generally comprises models with a mass per unit length below 30 kg/m, for example, GB 22 kg/m and GB 15 kg/m rails.

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

Firstly, regarding cross-sectional dimensions, heavy rails have a greater rail height, wider head, larger base, and thicker web. This results in greater overall sectional rigidity and bending strength, enabling heavy rails to withstand the significant longitudinal and lateral impact forces generated by high-speed trains or heavy-haul freight transport, while simultaneously reducing localized stress on sleepers and the ballast. Light rails have a smaller cross-section, making them suitable for light-duty railways or industrial tracks, but their bending and fatigue resistance capabilities are relatively limited.

crane rail

Secondly, there are notable differences in load-bearing capacity and service life. The high strength and large cross-section of heavy rails allow them to support greater train axle loads and higher operating speeds. They are commonly used in high-speed railways, mainline mixed passenger and freight lines, and heavy-haul freight routes, with a service life typically reaching 20-30 years or even longer. Light rails are suitable for branch lines, mining, or industrial light-duty railways where operating speeds and load-bearing requirements are lower, and their service life is comparatively shorter.

In terms of application scenarios, heavy rails are widely used in high-speed railways, heavy-haul freight transport, and industrial dedicated lines. Light rails are mostly employed in low-speed branch lines, industrial tracks, or temporary line construction.

15kg rail

GNEE RAIL routinely supplies various standard heavy and light rails and can provide customized processing services such as cutting, drilling, end grinding, and surface treatment. Whether for high-speed railways, heavy-haul freight lines, or industrial track projects, customers can select the appropriate rail specification based on actual needs and achieve optimal construction results and service life through custom processing.

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