The 18.08 London Bridge to Uckfield train should be 8 carriages long, and even so it is always packed and all the vestibules are full of people standing as are the gangways. Many people get off at East Croydon although it remains standing room only often as far as Edenbridge.
The outcome of course is that if it shortformed many of those wishing to go to stations beyond East Croydon cannot get on. So at London Bridge there will often be announcements on these occasions that the train will not stop at East Croydon. However it doesn't stop East Croydon passengers getting on and invariably the train does stop at East Croydon so they are fine. However those standing between them and the doors know announcements were made at London Bridge stating that the train would not be stopping at East Croydon so often don't assist them by moving out the way. So fairly regularly people end up going to Oxted as they can't get off at East Croydon when it is short formed.
On the same train it stops at Edenbridge, Cowden, and Eridge all of which can only take 5 coach trains. As mentioned the train is 8 coaches long, so if people are in the last carriage it can take people too long to get through to the 5th coach. Its even worse at Eridge because people wanting to get off at Crowborough start standing in the vestibules of the 6th coach as the train leaves Edenbridge, so by Eridge they are full. Those getting off at Erdige assume they are all getting off at Eridge, and by the time they realise its too late for them to get down to the 5th coach.
We probably have passengers who miss their station two or three times a week!