20092010JMRI GregMcCartney gpmccartney@gmail.com 1 2016-12-15 GPM Initial version of the signal set. WM 1980 US&S R-2 Single Arm with Low Marker Absolute Mast Signal As described in the 1980 version of the Chessie System Railroads Operating Rules. Appearances of WM single arm absolute US&S R-2 mast signals with a low red marker Clear green dark Page 142 ../../../resources/icons/smallschematics/aspects/WM-1980/WM_RYG-R_Absolute/Rule-W281.gif Approach yellow dark Page 143 ../../../resources/icons/smallschematics/aspects/WM-1980/WM_RYG-R_Absolute/Rule-W285.gif Stop red red Page 146 ../../../resources/icons/smallschematics/aspects/WM-1980/WM_RYG-R_Absolute/Rule-W292.gif Stop-Throw Switch red flashred Page 100 of the 1973 WM Rule Book ../../../resources/icons/smallschematics/aspects/WM-1980/WM_RYG-R_Absolute/Rule-W293.gif Stop Stop Clear Clear Approach Diverging Clear Diverging Clear Approach Approach Clear Diverging Approach Approach Slow Clear Approach Slow Approach Approach Restricting Approach Stop and Proceed Approach Stop Approach Stop-Throw Switch Approach