The on train data recorder (OTMR) provides a complete record of each state change of all monitored signals. Data recording takes place in a crash survivable memory module, with journeys in excess of 24 hours duration easily accommodated.

The Arrowvale Electronics RMD (Remote Monitoring Device) is an approved data logger which can connect to a large number of signals typically found on a rail vehicle. It can also take a real time or bulk data feed from an Arrowvale or Q-Tron OTMR.

Arrowvale Electronics has designed and manufactured a Drivers Interface Unit (DIU) that is remote from the Data Recorder, connected via RS232. This drivers' keypad includes a vandal-proof 12 button telephone-style keypad and a 20 character by 2 line liquid crystal back-lit display.

Every OTMR contains a Secure Storage Memory (SSM), and data from this can be easily transferred to a PCMCIA memory card for routine extraction and analysis.

An alternative method of determining driver ID is to use the TagIT system. Each driver is issued with a key-fob or ID card which has a small metal disc attached. This disc has a unique ID code embedded within it. A TagIT reader is installed in the driver's cab area and connected back to the OTMR via a network. As the driver logs on or off to the vehicle he touches his ID tag onto the tag reader. The code is read and transmitted to the OTMR. An LED mounted on the TagIT box flashes to confirm that the code has been successfully read and logged by the OTMR.

A GPS receiver can be interfaced to the OTMR then, via a low profile antenna mounted on the roof of the vehicle, accurate positional data can be determined and logged by the OTMR.