BI-4 Indicator Block for Efficient Data Collection and Registration

Indication unit BI-4 is designed to work as a part of complexes of data collection and recording devices KPD-3B, KPD-3P, KPD-3PA, KPD-3PV or other systems providing exchange interface, as a block of information display and setting the mode of operation. BI-4 should be operated in the locomotive or motorcar cab.