[Susan]

If we consider the coaches with the multiplex system we see that kind of analysis is being done to help isolate electrical problems. Right now the system is lacking the ability to pin point an electrical problem down to the specific relay or terminal connection, but it is possible via the information display and a set of wiring diagrams to make the diagnosis relatively easy.

The same thing can be done with the pneumatic system, but unlike the multiplex electrical system which has greatly simplified the entire coach by eliminating about 30% of the wiring, relays, fuses, circuit breakers, connections, etc. a pneumatic system could get even more complex. We can easily pinpoint leakages or uses of air that exceed specifications by having devices in the system that sense air flow, compare the flows to values, and “report” out of range conditions to help point to leaks in air lines, fittings or devices. The problem is the sensing devices in the electrical multiplex system actually are the “computers” that not only handle the flow of electric, but they also include the ability to sense, switch, act like fuses, and report out of spec conditions. To do the same pneumatically we would add a layer of complexity over that which we already have and probably increase the leak potential because the sensing devices could become a potential leak point.

If we wanted to make leaks less likely I think a great place to start would be to revert back to compression fittings and add valves and connection points for gauges or flow meters to aid in future diagnostics. It wouldn’t hurt if all pneumatics were “home runs” with a single manifold in a protected space so each circuit for each device could be tested from a single point. Some of that is being done now.