AAR 1946
1946
As described in the August 1946 version of the AAR publication "American Railway Signaling Principles and Practices", chapter II.
20092010JMRI
DickBronson
dick@rr-cirkits.com
BobJacobsen
jake@physics.berkeley.edu
1
2009-12-21
RGJ
Initial version
1.1
2009-12-27
DB, RGJ
Fix consistency, more aspects
2
2010-01-01
DB
More appearances
2.1
2010-01-01
RGJ
Add author and revision info
2.2
2010-01-11
DB
Typo Correction
2.3
2011-06-23
DB
Add speed and route information
2.4
2011-12-06
KC
Normalize all aspect names to not have hyphens
Clear Alt
Rule 281-alt
Proceed
Page 42
Unofficial Rule and Aspect Name to allow for optional appearance
Normal
Normal
Normal
Clear
Rule 281
Proceed
Page 42
Normal
Normal
Normal
Advance Approach Medium
Rule 281A
Proceed approaching second signal at medium speed
Page 42
Normal
Limited
Normal
Approach Limited
Rule 281B
Proceed approaching next signal at limited speed
Page 43
Normal
Limited
Limited Clear
Rule 281C
Proceed; limited speed within interlocking limits
Page 43
Limited
Normal
Diverging
Approach Medium
Rule 282
Proceed approaching next signal at medium speed
Page 44
Limited
Medium
Normal
Advance Approach
Rule 282A
Proceed preparing to stop at second signal
Page 44
Normal
Medium
Normal
Medium Clear
Rule 283
Proceed; medium speed within interlocking limits
Page 45
Medium
Normal
Diverging
Medium Advance Approach
Rule 283A
Proceed preparing to stop at second signal; medium speed within interlocking limits
Page 45
Medium
Limited
Diverging
Medium Approach Slow
Rule 283B
Proceed at medium speed approaching next signal at slow speed
Page 46
Medium
Slow
Approach Slow
Rule 284
Proceed approaching next signal at slow speed. Train exceeding medium speed must at once reduce to that speed.
Page 46
Medium
Slow
Normal
Approach
Rule 285
Proceed preparing to stop at next signal. Train exceeding medium speed must at once reduce to that speed.
Page 47
Medium
Slow
Normal
Medium Approach
Rule 286
Proceed at medium speed preparing to stop at next signal
Page 47
Medium
Slow
Normal
Slow Clear
Rule 287
Proceed; slow speed within interlocking limits.
Page 48
Slow
Normal
Diverging
Slow Approach
Rule 288
Proceed preparing to stop at next signal; slow speed within interlocking limits.
Page 48
Slow
Slow
Diverging
Permissive
Rule 289
Block occupied; proceed prepared to stop short of train ahead.
Page 49
Stop
Stop
Either
Permissive Medium
Rule 289-medium
Block occupied; proceed prepared to stop short of train ahead on medium speed route.
Page 49
Unofficial Rule and Aspect Name to allow for optional appearance
Stop
Stop
Either
Restricting
Rule 290
Proceed at restricted speed.
Page 49
Restricted
Restricted
Either
Stop and Proceed
Rule 291
Stop; then proceed at restricted speed.
Page 50
Stop
Stop
Either
Stop and Proceed Medium
Rule 291-medium
Stop; then proceed at restricted speed on medium speed route.
Page 50
Unofficial Rule and Aspect Name to allow for optional appearance
Stop
Stop
Either
Stop
Rule 292
Stop.
Page 50
Stop
Stop
Either