(03 Sep 2015, 4:40 pm)R852 PRG wrote I usually dodge the X21 for that exact reason. I've found the 09:58, 10:28, 10:58 and 11:28 departures from Chester-le-Street are set to burst.
At least one of the X22s around that time is also quite bad. I've been left without a seat on both services previously.