At 4:15 Company 12 was dispatched to transfer an engine to Co 18 (St. Thomas). At 4:29 while enroute Engine 12-2 was diverted to Co 9 (Mercersburg) while they were on a first due dwelling fire. Engine 12-2's crew stoodby at Co 9 until 6:26 when they were alerted to an auto accident at the intersection of Lincoln Way West & Path Valley Road. Crews arrived and did patient checks and secured hazards. Once state police arrived the scene was turned over to them and fire police and Engine 12-2 returned at 7:17.