How can you have a signal failure on an ATO system?
In article . com,
Boltar writes Interesting site , but it doesn't explain how the ATO and ATP are seperate if they both rely on the track codes. They're different functions within the train. The ATP relies on the four basic codes. It picks them up and, in essence, generates a set of permissions to the rest of the train: "can move", "can accelerate", "can start from station", "can start within tunnel", "maximum speed is X". These are then combined with the current state of the train to provide the two controls of "disable motors" and "apply emergency brakes". Thus the ATP only ever stops the train. The ATO takes the permissions from the ATP box, the commands from the command spots ("speed X", "coast", "brake"), distances from the odometer, and the map of the railway stored within the Auto Driving Box, to actually control the train. Thus if it sees the command spot "speed 40" from the track but "maximum speed is 25" from the ATO, it will accelerate or brake to 25. It relies indirectly on the four basic codes, but only via the ATP, not by picking them up itself. -- Clive D.W. Feather | Home: Tel: +44 20 8495 6138 (work) | Web: http://www.davros.org Fax: +44 870 051 9937 | Work: Please reply to the Reply-To address, which is: |
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