Two of my projects this weekend have been patching a GP9 for the L&A and mounting a Varney metal F3B shell on an Athearn F7 powered chassis. One was easy, the other not so easy. The GP9 is a Walthers GP9m, single flywheel, standard DC. The F3B is a Varney die-cast metal shell on a stock Athearn F7 chassis with a hard wired DCC decoder. The F3B is #2 in a three loco consist of all powered F units representing Stewart, Varney, Athearn, NWSL and Life-Like. The unit still has to be painted but is operational.