An Act relative to Hot Box detectors

This bill requires rail operators in Massachusetts to install hot box detectors (safety devices that monitor overheating train wheel bearings) every 20 miles along any railway line used by passenger trains. It applies directly to all rail infrastructure operating passenger service, including both new construction projects and existing lines. The law mandates that these detectors be included in all new rail construction and installed on all existing passenger rail lines within one year of the bill's passage. The change focuses on enhancing train safety by preventing overheating-related derailments.