WM 1980 1980 As described in the 1980 Chessie System Operating Rules. 20092010JMRI GregMcCartney gpmccartney@gmail.com 1 2016-12-15 GPM Initial version of the signal set. Clear Rule W-281 Proceed Page 142 Normal Normal Either Approach Diverging Rule W-282 Proceed approaching next signal prepared to take diverging route. Page 142 Normal Medium Either Diverging Clear Rule W-283 Proceed through crossovers, turnouts, sidings, interlocking limits, and over power switches at speed specified in special instructions for that location; then proceed at maximum authorized speed. Page 143 Medium Normal Either Approach Rule W-285 Proceed prepared to stop at next signal. Train or engine exceeding medium speed must take action at or before reaching approach indication to reduce to that speed. Page 143 Normal Stop Either Diverging Approach Rule W-286 Proceed through crossovers, turnouts, sidings, interlocking limits, and over power switches at speed specified in special instructions for that location; then proceed at not exceeding medium speed prepared to stop at next signal. Page 144 Medium Stop Either Slow Clear Rule W-287 Proceed; Slow speed through crossovers, turnouts, sidings, interlocking limits, and over power switches; then proceed at maximum authorized speed. Page 144 Slow Normal Either Slow Approach Rule W-288 Slow speed through crossovers, turnouts, sidings, interlocking limits, and over power switches; then proceed at not exceeding medium speed prepared to stop at next signal. Page 144 The mast signal shown here is a non-standard indication. The rule book shows this as an approach indication. Yet based on David Hughes' article in the WMHS Magazine show it was called Slow Approach and used at Emory Grove for west bound trains crossing over from track 2 to track 1 and entering the Hanover Subdivision. Interestingly westbound trains on track 1 would receive a standard Approach when routed for the Hanover Subdivision. Slow Stop Either Restricting Rule W-290 Proceed at restricted speed. Page 145 Restricted Restricted Either Stop and Proceed Rule W-291 Stop; then proceed at restricted speed. Page 145 Stop Restricted Either Stop Rule W-292 Stop and stay. Page 146 Stop Stop Either Stop-Throw Switch Rule W-293 Stop. Throw the switch. Page 100 WM 1973 Rule Book Stop Stop Either