 However, in the last years, lack of maintenance and care for the trams have hampered their performance and reliability, and only a handful of examples survive today, most of them having been cannibalized for spare parts, and the remaining ones undergoing refurbishment.An incident on 12 March 2019, where the wheels of tram 3381 (made in 1974) collapsed, forced the RATB to permanently withdraw the T4Rs in service, but after a few days they returned to service due to the shortage of trams on the network.They only run in solo formations, since they have been banned to run in double formations after tram 3385 (used as a trailer) caught fire on 23 August 2017.