Abstract: A temperature abnormality detection system includes: measurement devices; and a processor to determine temperature abnormality using a first temperature T1, a second temperature T2, and a third temperature T3. The processor determines occurrence of temperature abnormality when any one of following conditions is satisfied: (A) T1>A0 or T2>A0 or T3>A0; (B) T1>A1 and (T2?T1>A4 or T2?T1<0) and T2>A2 and T3>A3; (C) T1>A1 and T2?T1>A4 and T3>A3; (D) T1>A1 and T2?T1>A4 and (T3?T2>A5 or T3?T1>A6); and (E) T1>A1 and T2?T1<0 and (T3?T2>A7 or T3?T1>A8), where A1<A0, A2<A0, and A3<A0.

Abstract: A temperature abnormality detection system includes: measurement devices; and a processor to determine temperature abnormality using a first temperature T1, a second temperature T2, and a third temperature T3. The processor determines occurrence of temperature abnormality when any one of following conditions is satisfied: (A) T1>A0 or T2>A0 or T3 >A0; (B) T1>A1 and (T2?T1>A4 or T2?T1<0) and T2>A2 and T3>A3; (C) T1>A1 and T2?T1>A4 and T3>A3; (D) T1>A1 and T2?T1>A4 and (T3?T2>A5 or T3?T1>A6); and (E) T1>A1 and T2?T1<0 and (T3?T2>A7 or T3?T1>A8), where A1<A0, A2<A0, and A3<A0.

Abstract: Provided is a constant monitoring system for a railway vehicle that is monitorable of a dimensional change of a railroad truck during running. The present disclosure is the constant monitoring system for the railway vehicle that includes a sensor and a calculator. The sensor detects passage therethrough of wheels included in the railroad truck of the railway vehicle. The calculator calculates an inter-axle distance between two axles of the railroad truck based on a detection result obtained from the sensor. The sensor includes two displacement sensors of non-contact type that detect the passage of the wheels from respective different locations.