The normal EMD 27 pin MU cable is used for all push-pull operations on Irish Rail. What needed to be added was a parking brake and door controls. No 071/111 got these, 206 to 209 plus 215 to 234 and all the 121s except 121 and 125 got this equipment.
The Gatwick coaches certainly are a scandal. They were generally used for two runs a day Monday to Friday totalling under 100 miles with only occasional weekend use for sports specials. It was decided to convert the set to pushpull operation and purchase an ex British Rail driving trailer. (Cab Car) This vehicle was refurbished by a company (control stand from a retired 141 Class fitted) in England who delivered it 14 months late on contract at a cost of £400,000. It arrived in Belfast June 26 2009. The Gatwick coaches had been take out of service, as it later turned out permanently, 8 days before that. The Cab Car never left the Depot until it was taken on a truck to the Downpatrick Museum line in September last year. The three 111 Class locomotives never got push-pull equipment. 111 and 112 did have HEP fitted in 1991 but it was unreliable and seldom used.
The 450 Class DEMU have never been used in Sandite service. The remaining 80 Class used for this will be replaced by a multi purpose vehicle due for delivery in July 2016
The Gatwick coaches have not been scrapped and are now owned by the Railway Preservation Society of Ireland but will need major work to make them operational.