ASPECT
NAME Clear
INDICATION
Figure 2 Proceed at authorized track speed
Approach Medium
Proceed, approaching next signal at Medium Speed (30MPH)
Approach Limited
Proceed, approaching next signal at Limited Speed (40MPH)
Medium Clear
Proceed at Medium Speed (30MPH) within interlocking limits or through turnouts then proceed at maximum authorized speed
Limited Clear
Proceed at Limited Speed (40MPH) within interlocking limits or through turnouts then proceed at maximum authorized speed
Approach Slow
Proceed, approaching next signal not exceeding Slow Speed (15MPH)
pects defined in Figure 3. The ma- jor advantage being increasing the available indications achievable via flashing aspects. The result is realizable cost savings by using dwarf signals rather than mast sig- nals at each end of a passing siding while still retaining a full range of possible aspect indications. For the Figure 1d example, the
track arrangement is altered to il- lustrate the application of a “Me- dium Clear” aspect on Signal 4R. This informs the engineer of Train A to take the first divergent route, i.e., through Turnouts 3 and 5, at “Medium Speed” and then once en- tire train is clear of the turnouts it can resume maximum authorized track speed as also permitted by the next signal,10R, displaying “Clear” thus noting that the next two blocks in advance of the signal are clear. Figure 1e illustrates the dis-
Approach Proceed prepared to stop at next signal
Medium Approach Medium
Proceed at Medium Speed (30MPH) within interlocking limits or through turnouts then approach next signal at medium speed
Medium Approach
Proceed at Medium Speed (30MPH) within interlocking limits or through turnouts then approach next signal prepared to stop
Limited Approach
Proceed at Limited Speed (40MPH) within interlocking limits or through turnouts then approach next signal prepared to stop
Slow Clear
Proceed at Slow Speed (20MPH) within interlocking limits or through turnouts then proceed at maximum authorized speed
Slow Approach
Proceed at Slow Speed (15MPH) within interlocking limits or through turnouts then approach next signal prepared to stop
patcher routing Train A from the main track unto the branch line. This is accomplished by taking the diverging routes at both Turnouts 3 and 5, the latter assumed to be a Slow Speed Turnout (No. 12 on prototype and No. 6 on the model). To accomplish this move, Signal 4R displays a “Slow Clear” based on the limitation of Turnout 5 and to ensure that Train A will have its speed decreased to “Slow Speed” (20 mph) by the time it reaches Signal 4R, intermediate Signal 246 displays an “Approach Slow.” Pret- ty neat, isn’t it? In example Figure 1f, I substitut-
Restricting Proceed at restricted speed
Stop and Proceed
Stop and proceed at restricted speed
ed a yard, which is unsignaled, in place of the branch line. The most favorable signal indication possible when leaving signaled territory to enter dark (unsignaled) territory is “Restricting” as displayed by Sig- nal 4R. Some railroads do make use of an “Approach Restricting” aspect, which in their case would then be displayed on intermediate Signal 246. However, because an engineer
A
Absolute Stop
Stop and stay stopped
might have to stop anytime in ad- vance of a Restricting signal, in- cluding just a few feet in advance
58 RAILROAD MODEL CRAFTSMAN
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