A communication system for a distributed locomotive powerbrake control system for a railroad train having a lead locomotive and one or more remote locomotives. In addition, a crystalline mono mesylate salt and crystalline mono sulfate salt of -4-dimethylamino-3,10,12,12a-tetrahydroxy-7-amino)-methyl-1,11-dioxo-1,4,4a,5,5a,6,11,12a-octahydro-naphthacene-2-carboxylic acid amide are also disclosed having improved stability. The handle assembly includes a pair of backing such that the backing sections extend around the handle section. The input circuit produces, in response to the voltage signal, either a first signal or a first circuit condition at the output terminal of the input circuit, representative of the changing current in the power cable.