In addition to new LRVs, San Diego Trolley also slowly retrofitted the SD-100s LRVs with new paint, door sensors & switches, wheelchair lifts, route display signs, and interior & exterior lighting. The oldest model U2 trolleys had very little that can be done to improve their functionality or operation as they lacked the overhead equipment compartments found in the SD-100s and S70s, and were planned to be entirely phased out and retired by 2015. Eleven of the U2 cars were sold to the upstart Metrotranvía Mendoza in Mendoza, Argentina; another 29 had been retired by early 2013, and the rest of the U2 trolleys were retired from service in January 2015. Six U2 cars have been preserved: car 1019 at the Rockhill Trolley Museum, cars 1003 and 1008 at the Orange Empire Railway Museum, as well as cars 1017 and 1018 at the Western Railway Museum; car 1001 has been retained by MTS and was restored for use on the Silver Line.