Mark Vogel: The Washington Terminal Company 1925
Mark Vogel: Washington Terminal - Bridge Signals
Mark Vogel: Washington Terminal - Color Light Signals and Road Signals
Mark Vogel: Washington Terminal - Ground Signals
Mark Vogel: Washington Terminal - Automatic Signals
Mark Vogel: Washington Terminal - K Interlocking
Mark Vogel: Washington Terminal - A Interlocking
Mark Vogel: Washington Terminal - C Interlocking