Figure 1 245 A 246


Approach Medium


4R Approach 5 8RB 4LC a. Approach Medium and Approach 4L 245 A 246


Approach Medium


4R 4LB


Medium Approach Medium


5 8RB 4LC


b. Approach Medium and Medium Approach Medium 4L


245 A 246


Approach Medium


4R 4LB


Medium Approach


5 8RB 4LC c. Approach Medium and Medium Approach 4L 245 A 246


Approach Medium


4R


Medium Clear


5 3 8R 4LB 10R 4LC d. Approach Medium and Medium Clear 4L 245 A 246


Approach Slow


4R


Slow Clear


5 3 8R 4LB 8RB 4LC e. Approach Slow and Slow Clear 4L 245 A 246 Approach 4R Restricting 5 8RB 4LC Yard f. Approach and Restricting Yard Drill 3 8R 4LB 7 275 Branch 276 8L 7 7 275 Branch 276 8L 7 10L 275 Branch 276 8L 3 8R 7 275 Branch 276 8L 3 8R 7 275 Branch 276 8L


Speed Signaling Application Examples 8L


4L 3 8R 4LB 7


short OS section at Turnout 3, for Train A to come to a stop at Sig- nal 8R. Also, Turnout 7 is aligned for the siding and Signal 8L is at “Medium Approach” to guide the opposing train to be at “Medium Speed” through the diverging route at Turnout 7 and into the siding, preparing to stop at Signal 4LB. Figure 1b illustrates the dis-


patcher routing Train A through the passing siding rather than tak- ing the main route, such as might occur if the main track is out of service or if Train A was a pas- senger train and the station was located on the siding. In this case, Signal 8RB is at “Medium Clear” signifying that must continue at medium speed through Turnout 7 and next two blocks are clear; Signal 4R is at “Medium Approach Medium,” indicating to proceed through Turnouts 3 and 5 at “Me- dium Speed” and approach the next signal, which is 8RB, at “Medi- um Speed.” The intermediate Sig- nal 246 is at “Approach Medium,” informing the engineer of Train A to approach the next signal, which is 4R, at “Medium Speed.” Figure 1c is the same as Figure


1b except, in this case, the dis- patcher is holding the approach- ing train, Train A, on the siding at Signal 8RB in anticipation of a meet with an opposing train that is set up to hold the main track, via Turnout 7 aligned for the main track and Signal 8L displaying “Ap- proach.” In this scenario, Signal 4R is changed from the “Medium Ap- proach Medium,” as it was in Fig- ure 1b, to a “Medium Approach,” which informs the engineer of Train A to proceed through Turn- outs 3 and 5 at “Medium Speed” preparing to stop at the next signal (in this case, Signal 8RB). Inter- mediate Signal 246 displays “Ap- proach Medium” just as it did in Figure 1b. Up to this point we have applied


the aspects defined in Figure 2. To illustrate more variety in applica- tion, such as might occur modeling a different railroad or era, the next three examples use the dwarf as-


56 RAILROAD MODEL CRAFTSMAN


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