Perhaps "normal" was the wrong word.
From JourneyCheck:
Delays to services between Oxford and Worcester Shrub Hill
Due to a fault with the signalling system between Oxford and Worcester Shrub Hill trains have to run at reduced speed.
Train services running through these stations may be delayed by up to 20 minutes. Disruption is expected until 01:30 01/06.
Last Updated:01/06/2018 00:23
RTT» reports:
18:22 Paddington - Hereford arrived Hereford at 00:48, some 196 late
19:22 Paddington - Hereford cancelled after Oxford "due to a problem with the traction equipment (MD)"
20:22 Paddington - Great Malvern cancelled throughout "due to late arrival of an inbound service (YI)"
On JourneyCheck as being "due to a problem with the crew".
21:48 Paddington - Shrub Hill currently (01:04) 77 late at Moreton-in-Marsh
18:34 Great Malvern - Paddington cancelled after Shrub Hill "due to an issue with the train crew (TG)"
19:42 Great Malvern - Paddington arrived 107 late
20:59 Foregate Street - Paddington cancelled after Oxford "due to a signal failure (J3)". Arrived Oxford 88 late.
21:51 Hereford - Paddington currently 69 late at Oxford