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Railhead Vision Systems


Crash-Hardened Memory Module

Crash-Hardened Memory Module (CHMM)
with Multiple Storage Options

The Railhead Crash-Hardened Memory Module (CHMM) or Audio and Image Recording System Memory Module, is a passenger and freight rail-ready platform that meets both FRA and IEEE industry standards for Event Recorder crash-worthy memory (ERMM). The Railhead CHMM is designed to withstand even the most severe impacts and temperature extremes. Available with different levels of storage capacity and mounting options to fit any cab car or locomotive. Set up is easy with a single cable that plugs into a front-panel port on the Railhead LDVR4K recorder. Our advanced technology manages data anomalies and improves data consistency to reduce write operations and optimize SSD speed and lifespan.


  • Automatically configures upon connection to LDVR4K
  • Mounts in standard LSI rack (MCU5 size) or floor/wall mount
  • Available with 128GB, 256GB, 512GB, or 1TB memory capacity
  • Power protection maintains data integrity during power on/off and outages
  • Utilizes standard license-free Railhead System Management (RSM) software for data retrieval
  • Capable of storing different types of data such as PTC, Event Recorder, LDVR audio/video and discrete inputs
  • Compatible with Operating Systems having USB2.0/3.0 mass-storage driver such as Windows and Linux 2.4+


  • Storage: 128GB, 256GB, 512GB or 1TB
  • Interface: eSATA / USB2.0 / USB3.0
  • Operational Temperature: -40C to +85C
  • Dimensions: 6" x 6" x 5" (152mm x 152mm x 125mm)
  • Weight: 12 lbs. (5.4kg)
  • Wear Leveling: An algorithm distributes and writes evenly across all pages
  • Cable Connector: M-12 (12-pin)
  • Cable: USB-IF High-Speed certified
  • Cable Length: Standard 1 meter
  • Vdd: 4.7V - 5.5 VDC
  • Power: 2.2W (max.)
  • MTBF: > 3,000,000 hours
  • Compliance: FRA 49 CFR Part 229 IEEE 1282.1-2013