A gauge rod is used to check and maintain the correct track gauge-the exact distance between the inner faces of the two running rails. This measurement is critical for safe railway operation because even small deviations can lead to rough rides, excessive wheel and rail wear, or, in severe cases, derailments.
| No. | Part | Quantity | Specification | Material |
| 1 | rod | 1 | M30 M36 | 3# |
| 2 | iron card | 4 | I type II type | KTH350-10 |
| 3 | plain washer | 4 | M30 M36 | 3# |
| 4 | nut | 4 | M30 M36 | 3# |
| 5 | spring washer | 4 | M30 M36 | 65Mn |
Here's how it works in practice:
Verification of track gauge.
Maintenance crews place the gauge rod (sometimes called a track gauge) across the rails at a specified point. The rod is machined or adjustable to the standard gauge for that line (for example, 1,435 mm / 4 ft 8½ in for standard-gauge railways). If the rod fits without forcing or slack, the rails are at the correct spacing.
Detection of tight or wide gauge.
If the rod cannot be set into place, the gauge is too narrow (tight). If it fits loosely or rocks, the gauge is too wide. Either condition signals the need for maintenance-tight gauge can create wheel-rail binding, while wide gauge can increase the risk of derailment.
Assessment of overall track geometry.
When used along a stretch of track, gauge rods help inspectors identify trends such as gradual gauge widening on curves, settlement of ballast, or loose fastenings.
In short, a gauge rod is a simple but essential tool to check that the spacing between the two rails remains within the railway's specified tolerance, ensuring safe, smooth, and reliable train operations.
Gauge Rod from GNEE RAIL
- Material: Q235
- Application: 30, 43, 50, 60, 75kg/m steel rail.
- Rail Gauge: 600, 762, 900 and 1450.
- Diameter: 20, 22, 24, 28, 32, 36 etc.
- Specification: 20×870, 22×880, 22×1050, 24×1050, 24×1250, 28×1810, 28×1850, 32×1810, 32×1850, 36×1850
