2. Delivering Engineered Solutions Optonator ® the fibre optic railway “detonator” (Once started the PowerPoint show will advance the slides automatically. Further mouse-clicking will interrupt slide sequencing

3. Delivering Engineered Solutions The Tebay Problem “The wagon rolled straight over detonators put on the track to alert drivers to danger ahead and smashed straight through a stop board clipped across the line. But that was two miles away. The man went on: “It was too far for any of the lads to hear the bangs. They were working with their lights on, concentrating on their job.” [ Testimony by a colleague of the four rail workers killed by a runaway wagon at Tebay, Cumbria, UK on Sunday February 15 th 2004 ]

4. Delivering Engineered Solutions Work Site Perimeter protection Remote Sensor Unit Fibre Optic Work site protection Work site protection

5. Delivering Engineered Solutions Alarm Output Inactive ALARM ! OK X Perimeter protection Remote Sensor Unit X Work Site Fibre Optic If remote detection fails then alarm warning given Scenario #1 Unexpected loss of train warning detection

6. Delivering Engineered Solutions Scenario #2 Incursion into possession by manned rail vehicle Work Site Alarm Output Inactive TRAIN ALARM ! OK ALARM Fibre Optic Perimeter protection Remote Sensor Unit Unaware of signaller’s instruction, train driver hears the detonators and stops train

7. Delivering Engineered Solutions Work Site Alarm Output Inactive ALARM ! OK ALARM Scenario #3 Incursion into possession by unmanned rail vehicle Remote Sensor Unit Fibre Optic TRUCK Perimeter protection Unmanned runaway vehicle is unaffected by signaller’s instruction and detonators.

8. Delivering Engineered Solutions Wheel strike at worksite boundary Optonator Transmitter – just before and just after the leading wheel enters the Track Worker Safety zone Note. Alarm indictor is off, then on after wheel contact Fibre sensor

9. Delivering Engineered Solutions Summary Optonator ® addresses: Runaways protection Procedural Errors Misunderstandings By providing failsafe vehicle detection via cheap, expendable optical fibre this product can cost-effectively enhance track worker safety

10. Delivering Engineered Solutions