TAC32s are meant to be mod or new installation controllers... can be used for hydraulic or traction jobs. Best thing about them is the lack of relays, so less contact failures than the 20s or 22s...
As for being non-proprietary, maybe technically, but another company just took over a bunch of these units from us, and they've had a terrible time with them...
Playing the slots at the mainline only gets you so far...
