How long is a section of railroad track?

How long is a section of railroad track?

A railroad track section, also called a rail length or rail bar, is the individual piece of rail used to form the continuous railway track. The length of each rail section varies depending on the railway standard, the type of rail, and the application, such as heavy-haul, passenger, metro or urban light rail. On modern lines, individual sections are joined by welding into continuously welded rail (CWR) that can exceed one kilometre, so joints are limited to specific locations such as turnouts and insulated joints.

Typical rail section lengths by standard

Steel rail standards reference

Steel rails are supplied to different national and international standards. The following table summarizes common standards, typical rail weights and material grades:

Why section length matters in track design

The number of joints directly affects track geometry, wheel impact and maintenance workload. Longer rail sections mean fewer joints, smoother running and lower maintenance, which is why heavy rails are usually rolled in 25 metre lengths where logistics allow. On electrified and automatic block sections, the rail itself is also used as a track circuit, so insulated joints must be placed according to the signalling design. For crane runways and special trackwork, rail length is matched to the runway layout to minimize cutting and waste.

FAQ

1. What is the standard length of a rail in China?

Chinese heavy rails of 50 to 75 kg/m are typically rolled in 12.5 or 25 metre lengths. Longer sections are preferred on new lines because they reduce the number of joints and the associated maintenance.

2. How long is a UIC 60 rail section?

UIC 60 rails are commonly supplied in 12 to 25 metre sections depending on the rolling mill and project requirement. On modern European lines these sections are welded into long rails exceeding one kilometre.

3. What is continuously welded rail?

CWR is track in which individual rail sections are welded end to end into long strings, typically over one kilometre. It eliminates most joints, giving smoother ride quality and lower maintenance, while managing thermal stress through careful laying temperature control.

4. How long are crane rails?

Crane rails such as QU70 to QU120 are commonly supplied in 12 metre lengths, or custom lengths to match the crane runway layout and minimize on-site cutting.

5. Why are light rails shorter than heavy rails?

Light rails of 8 to 30 kg/m are used on urban and industrial lines where curves are tight and logistics are constrained, so shorter sections of 9 to 12 metres are easier to handle, transport and lay.

6. Does rail length affect the track circuit?

Yes. On electrified and automatic block sections the rails carry the track circuit current, so joints are electrically insulated at defined locations. Longer welded sections change where insulated joints are placed, which must be coordinated with the signalling design.