Wuhan Railway Bureau's CP3 measurementand track alignment adjustment

Wuhan Railway Bureau's CP3 measurementand track alignment adjustment

Summary

In 2021, within the jurisdiction of the Wuhan Bureau, the sectionfrom Hankou to Yichang, with a total length of 300 kilometers,underwent CP3 surveying operations.Railwaycare has re-calibrated the geometric dimensions of therailway tracks. Based on the standard of posterior intersectiondetection, eight reference points were used for repeatedcalibrations, thereby establishing a standard geometric state forthe tracks.

Re-measurement of CP3 railway benchmark network – the section from Wuhan to Yichang

  The CPⅢ absolute coordinate re-measurement on the Wuhan–Yichang section is a benchmark verification of the track control network, conducted during the critical phase of track fine-adjustment. Due to bridge creep, shrinkage, thermal effects, and construction loads during the project, the CPⅢ control points may have undergone displacement, rendering the original survey results insufficient to meet the millimeter-level accuracy required for track adjustment. This re-measurement adopts the resection method, which efficiently obtains station coordinates through distance-and-angle intersection and performs a re-solution of the network. The primary focus is on checking point coordinate consistency and eliminating unstable points. The objective is to restore the absolute benchmark of the CPⅢ network, provide reliable reference data for subsequent fine-adjustment operations, and fundamentally ensure the safety and ride comfort of high-speed train operations at 250 km/h.


Track Geometry Inspection Trolley RCI INS : Inertial Navigation | Full-Parameter Measurement

The GNSS‑based railway track inspection system comprises the following components:

● T‑shaped trolley – carries the core INS and the Sleeper Identification and Positioning System
● Inertial Navigation System (INS) – provides core attitude and position measurements
● Sleeper Identification and Positioning System – identifies sleeper positions and assists in localization
● Data processing unit – a ruggedized military‑grade laptop with integrated data acquisition and analysis software
● High‑precision total station (optional) – coupled with the system for maximum absolute accuracy
● Dedicated software suites – support ballastless track fine‑adjustment and ballasted track adjustment workflows

Implementation & Test Results

Application Scopes
   On CPIII / Fixed Peg Controlled Lines: Measurement of internal track parameters and external alignment parameters (both plane and elevation).
   On CPI / Fixed Peg Controlled Ballastless Tracks: Long-wave fine adjustment.
   On CPI / Fixed Peg Controlled Ballasted Tracks: Guidance for precise, digital tamping operations using tamping machines.

Daqin Railway

Conclusion

Through the Railwacare's Track Geometry Inspection Trolley RCI INS device, it is possible to precisely control the geometric dimensions of the track network, as well as measure the absolute coordinates of the track.
It is used in both passenger and freight transportation lines. It can effectively measure the geometric parameters of the tracks. After data analysis, the tracks can be improved to achieve better smoothness.

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