I am adding digital equipment to my analog layout (a C7030 PB and a couple of independantly powere XLCs). The original analog setup will remain in place (pseudo analog as supplied by PB Pro/C7042 does not meet my requirement) but Scalex states that digital circuitry must not be exposed to analog DC voltage, so my plan is to wire a SPDT relay into the 7030 box . The relay switch is connected to the P1 input and the track wires to the double throw contacts, so when the C7030 is supplied with power the contacts close and the track is connected, otherwise it is isolated from the electronics. The power supply is swithched between the two setups (i.e when digital is in use, the analog connection is not powered and vice versa). Anybody tried this? If so what relay did you use? If no, anbody see any pitfalls? Any problem with the digital track sensors living in a 12VDC environment?