After departing Gillingham on the ‘1E95 London Bridge to Ramsgate’ service with the 465, you will eventually come to a halt upon approaching a red signal. In front of my train and the red signal is just trains stuck behind more red signals that continue for ages. Please fix this bug dovetail!
If you have TSW4 the workaround is deleting the trains ahead stuck at red by using the spawn or delete trains icon, climb down of you train, go on foot near the stuck train, open the spawn icon with left arrow and select delete train, after that return to your train, accept service and the signal should be green
This can also be done from the map AFAIK - move the cursor/white dot over the leading carriage of the train that is blocking you, click X, then remove train. Repeat for other trains. Just make sure you don't delete your own train.