Thanks for observing. Yes, the new columns denote the avg Departure & Arrival delays at the respective stations, over the last 30 days. There is some spurious data in the site, especially for trains that have had monsoon TTs. So, you may see some suspicious figures here and there. We shall be refining this feature and removing/correcting the bad data in the coming days.
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Especially, we shall be taking out the "outliers", which is to say that if a train is delayed by 20 hours on one particular day due to some...
more... weather-related sporadic incident, in the current scheme, the Avg Delays will shoot up - this gives a wrong representation, and we shall be adjusting for such situations.
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The modified TT with Avg. Delays is also now available in the PDF printouts of the TTs. Also, new PF and Avg Delay columns have been added to the search results pages. Coming soon, the same will be added to the Chain pages - this will allow us to better examine the buffer times vis-a-vis the avg. delays at the Xfer stations.