What key items need to be validated when railway pressure transmitters are used in train braking systems? This article reviews validation requirements for measurement points such as the brake pipe, main air reservoir, and brake cylinder, covering range and accuracy, dynamic response, pressure resistance and sealing, pressure cycling, vibration and shock, electromagnetic compatibility, and fault response. It also explains requirements for interface compatibility, system integration testing, and batch traceability to help quality control, procurement, and safety management personnel develop traceable validation checklists.