Barriers are handy backups for train crew. On the west coastway line, there used to be a high occurrence of ticketless travel between Lancing and Shoreham. It's only 3 mins, but many of the locals treated it as a free ride. When you caught the wont pay mob, all you could do was throw them off at the station they were going to anyway. Then Shoreham got barriers, and they seem to be manned when many others are not. Thus ticketless travel between the two stations dropped.
Its amazing at stations when the barriers are open how many folks will walk pass the open ticket office and ticket machines and board without tickets, and as a guard its quite depressing to be working trains on a line where the stations are 2- 3 mins apart, then come into the major stations with barriers and find them open.
Its also amazing to see the traffic at the first station without a barrier outside of a main town. Aldrington. Tiny station, no car park, bus stops a bit of walk, but no barrier, only 5 mins from Brighton, including a stop at Hove, yet sometimes quite busy. hmmm wonder why?
Ok, they are not the solution to all issues, but they help. You can see the only downside at Brighton station at about 3.50 in the morning. First train, first stop Haywards Heath. The staff lock out all barriers and passengers have to go through one gate where each ticket is checked. Bought a ticket to Preston Park. Nope. Go back and try again.
When conversations go like this, your happy that barriers work.
Can I have a ticket to Brighton.
Where from?
Hove
I watched you get off the train from littlehampton to London, try again.
Aldrington
It does not stop there, try again...
Errr, Errr, Errr Shoreham.
There are ticket barriers at Shoreham
They were open, and the guy let me through.
mmmm, ok £X.XX. I guess just a single then.
Errr yes.