Approaching Euston on line A, any TPWS equipped train will brake when passing the last signal before entering the station, regardless of speed or signal. Go to 1:10 in the video below.
FYI - I reported this problem to the Help Desk - which I assume you have also done "Posted on: 15 December 2020 08:22 PM NEW The last signal before Euston Station on Line A, WM488, causes a TPWS Application (I Assume) when you pass the signal showing a Single Yellow with a Platform Indication. A Quick Drive from Watford on the Pendolino was spoilt by the Emergency Brake Application - speed was around 35 on a 40 MPH stretch I tried a Free Roam with both the Pendolino and the Voyager with the same result Even passing the signal with a Single Yellow and P4 at 10mph causes an Emergency Application. Thanks" The more people report it officially the better chance of a fix