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| Re: TA is obsessed with CBTC, and ''New'' tech for no reason. (579331) | |||
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Re: TA is obsessed with CBTC, and ''New'' tech for no reason. |
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Posted by trainsarefun on Sun Mar 2 09:53:00 2008, in response to Re: TA is obsessed with CBTC, and ''New'' tech for no reason., posted by Stephen Bauman on Sun Mar 2 05:58:59 2008. Just how does that happen with the follower in mid-block after the follower has entered the block? A downgrade can occur at the next block boundary.What would a speed control system do in this kind of situation: train B is following behind train A, which is very short, maybe even a single car or locomotive. While the rear of train A is still occupying part of block 1, the front of train B enters block 1 under a 'stop and proceed' signal, meaning that train B has to stop at the signal and proceed at restricted speed prepared to stop. Let's say that at this point train A stops just inside the next block, block 2. Train B's engineer is proceeding at restricted speed prepared to stop well within her field of sight. But let's say that she nods and the train continues at or below restricted speed (which let's stipulate that under the rules of this railroad is 10 mph - still more than enough to cause a bad collision). If train B's engineer doesn't receive the 'ringer' downgrade until the block boundary, it seems perhaps too late to prevent a collision with train A, unless train B can receive a downgrade before train B has crossed the block boundary between blocks 1 and 2. Am I reading you right that suggest that downgrades can only be given to a train once per block, at the block boundaries? A downgrade on the current block after the follower has entered it suggests that the leader has crossed an IJ in the direction going towards the follower. The leader - more like follower in the wrong way, now! - shouldn't be able to do that, no? Wasn't THAT among the things that went wrong here? |
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