 Very occasionally, during times of disrupted working, 4COR sets with 2HAL and 2BIL units that had been cascaded from the main line would be seen – the former causing substantial delays owing to the lack of doors for quick rush-hour loading.Currently the services to Guildford and London Waterloo are using Class 455 sets built in the early to mid-1980s, which have now all undergone an extensive refurbishment program which was completed in 2008.Refurbished 2 car sets of Class 456 formerly in service with Southern (Railway), have been used since 2017 to extend peak hour services and some off peak services to 10 car operation.