Temperature calibration involves adjusting and verifying the accuracy of temperature measuring instruments to ensure they provide correct readings. In the railway sector, this process is crucial for various applications. For example, the calibration of rail thermometers is vital for monitoring track temperatures, which can affect track stability and train speed regulations. The National Railway Administration has issued calibration specifications for rail thermometer calibration devices to standardize this process . Additionally, standards like TB/T 2953-2015 outline high and low-temperature testing methods for railway signaling products, ensuring their reliability under different environmental conditions . By adhering to these calibration practices, railway operators can ensure that temperature-sensitive equipment operates accurately and safely.