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Stephen Bauman

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  1. Stephen Bauman

    CBTC - General Discussion

    You have to define quantitative performance criteria that CBTC must meet, in order to answer that question. First, does CBTC meet all the criteria? Next, are there other technologies that can meet the same criteria? If the first is true, then CBTC would be "sufficient" in a mathematical sense. If the second is false, then CBTC would be "necessary" in the same mathematical sense.
  2. Stephen Bauman

    CBTC - General Discussion

    It's fairly easy to calculate the effect of train length on max TPH. Headway is the inverse of TPH, with a change from hours to seconds. 40 TPH translates to a 90 second headway. Part of the headway calculation is the time it takes a leader to clear a block for the follower. The leader will usually achieve cruising speed before the block between him and the follower is cleared. If we assume that cruising speed is 30 mph (45 ft/sec) and train lengths were increased from 400 to 600 feet, then it would take an extra (600-400)/45 or 4.4 seconds. Thus the headway would be increased from 90 to 94.4 seconds and the maximum TPH would be decreased to 38 tph.

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