I only experienced two guards on my recent trip. One of them I don't think did any revenue at all (at around 2200). The other was very proactive and I think managed to check everyone on the train by hopping between vehicles at stations (mid-morning). I also recall from a previous trip that all tickets were checked on the one journey I made. But I'm not sure if that's enough of a sample size to draw a conclusion!But what about non payment of fares - is that a major issue on the network?