Pictured (below) would operate well, add one more device and the whole system went south. I also had difficulty mixing newer Lionel components with older IC Control components. The Grey cable, top of command base, lower right, supplies signal, to the (8) IC Control components, pictured. Two components, left in picture, are Block Power Controllers (BPC's). Six, picture center, are (ASC) Accessory, track Switch Controllers. Five are used for switch control, (4) switches per controller, (20 switches total) (1), lower right, above the silver box, is used as accessory control. All is keyed/operated from the Cab1 handheld control.
The switches were numbered, corresponding to the TMCC remote/ASC configuration.
The original BPC's, Block Power Controllers, were designed for 15 amp track circuits, which proved a bit light, on dead short derails. The internal traces on the PC boards would fry. Later, one of the first things Lionel did, with the IC Control system, was increase the capacity of the BPC's to 20 amps.
