Nov. 10th, 2008

Last week, I got the following series of alerts from the MBTA's T-alerts system:

1. Framnghm/Worc: All inbound trains experiencing over 30 min delays due to CSX radio communication failure. 11/6/2008 5:08 AM
 Sent: 11/6/2008 5:09 AM

2. Framnghm/Worc: #500 (4:45am inbound) experiencing 20-25 min delay from Ashland into Boston due to CSX radio communication failure. 11/6/2008 5:08 AM
 Sent: 11/6/2008 5:23 AM

3. Framnghm/Worc Line experiencing 15-25 min inbound delays due to CSX radio communication failure 11/6/2008 5:51 AM
 Sent: 11/6/2008 5:54 AM

4. Framnghm/Worc #504 (6:05am ib) experiencing 15 min inbound delays due to CSX radio communication failure 11/6/2008 5:51 AM
 Sent: 11/6/2008 7:15 AM

From this series of alerts, we can conclude that train #506 (6:30 am inbound) is:
a) between 15 and 25 minutes late, per #3, since it's an instance of an inbound train on the Framingham/Worcester line
b) on time, since specifying that #504 (the previous train) is 15 minutes late cancels any general statements about the line, or
c) we can draw no conclusion.

The answer, of course, was b.  Perfectly logical, right?  Perhaps someone could work this kind of inference into, say, the parser for t-tweet....

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lehser

June 2010

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