Champaran HumSafar Express : इन अजनबी सी राहों में, जो तू मेरा हमसफ़र हो जाये, बीत जाए पल भर में ये वक़्त, और हसीन सफ़र हो जाये. - Piyush Singh

Bhai sahab log ek doubt clear kijie mera! I had to board ndls ipr magadh exp from ndls to mgls, I learnt earlier that magadh has three rakes. The rake which reaches IPR with right time have only two hrs before again magadh up has to start its journey and in reality it is always late for more than 04 hrs, so the third rake caters this time and it is placed to commence journey. That means the second rake which reaches IPR commence its journey next day even if it reaches IPR right time.
This is not the case from ndls side as I had learn. The rake which reaches ndls as magadh up at 1115 hrs commences journey same...
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day evening at 2000 hrs as magadh down.
If it gets late by more than 08 hrs then the train magadh down is rescheduled.
Now my doubt is today magadh up was 09:30 hrs late and it was expected to reach ndls at 2050 hrs but magadh down was placed on platform 15 at 1940 hrs and started journey at 2007 hrs. How this happened? Where I am wrong?
Wether magadh has 04 racks or some other train rake is placed for it or any other reason is there.
Any knowledge to anyone, kindly share please.