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This Railroad Accessories Corp. Signal Rectifier is a 3-phase stepdown transformer and rectifier. This takes a 3-phase AC electrical signal and turns it into DC for use on railroad signals.
by NEPATrains.org - Public domain
This is the [[ Railroad Accessories Corp. Signal Rectifier ]] with its Selenium Signal Rectifiers (the front) removed. This allows you to see the connection diagram hidden behind them.
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