Signal Aspects: Boston & Maine

Signal Aspects -- B&M

Boston & Maine


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Incomplete. Dwarf signal images not yet ready.

Note 1

Thanks to Dave Pierson for supplying this information. As shown, signal aspects are ca. 1970.

Note 2

Original specifically shows staggering for Automatic and Auto Approach signals. These images are not yet ready and apart from staggering, are identical with unstaggered signals. Dwarves were also staggered so used.

Rule # Aspect(s) Aspect Name

Indication
Home Interlocking Auto Approach Auto
? g/g g/g/# g/# Clear

Proceed.
? y/g y/g/# Approach Medium

Approach next signal at Medium Speed.
? y/y y/y/# Approach Slow

Approach next signal at Slow Speed. Train exceeding Medium Speed must reduce to Medium Speed.
? y/r y/r/# y/# Approach

Approach next signal prepared to stop. Train exceeding Medium Speed must reduce to Medium Speed.
? r/r/#   r/# Stop and Proceed

Stop and proceed [per] Rule 509.
? g/r Medium Clear

Proceed, Medium Speed through interlocking limits.
? Medium Approach Slow

Proceed, Medium Speed through interlocking limits, then proceed at Medium Speed, approaching next signal at Slow Speed.
? Medium Approach

Proceed, Medium Speed through interlocking limits, prepared to stop at the next signal. Train exceeding Medium Speed must reduce to Medium Speed.
? r/g g Slow Clear

Proceed, Slow Speed through interlocking limits.
? r/yf yf Slow Approach

Proceed prepared to stop at next signal. Slow Speed through interlocking limits, then not to exceed Medium Speed.
? r/y y Restricting

Proceed at Restricted Speed.
? r/r r Stop

Stop.
Miscellaneous Signals
? black G on 12" dia yellow plate Grade Signal

Modifies Stop and Proceed to Proceed to next signal at Restricted Speed.
? lighted L on yellow plate Hot Box Indicator

[Stop train and] Contact dispatcher.
?  u
r r
 u
Holding Signal

?Contact dispatcher.
Definitions
Medium Speed
Not exceeding 30 miles per hour.
Slow Speed
Not exceeding 15 miles per hour.
Restricted Speed
... permitting stopping short of train or obstruction, or switch not lined, but not exceeding 15 MPH.
Yard Speed
... permitting stopping within 1/2 range of vision, but not exceeding 15 MPH.

Cited Rules

(from 1961 Book of Rules)

S-509
When a train is stopped by an automatic block signal it may proceed at once at restricted speed, if next signal in advance can be plainly seen to indicate proceed and track is clear. If next signal in advance cannot be seen to indicate proceed, wait 5 minutes, and proceed at yard speed to next signal. Under conditions which seem to conductor or engineer to require extra care, protection may be provided to precede train through to next signal.
S-509a
An inferior train when going into a siding within limits of a block to clear a superior train, in accordance with rules S87-89 may pass a Stop indication displayed by the block signal providing it can clear the superior train as prescribed by rule.
D-509
When a train or engine is stopped by an automatic block signal it may proceed at once at restricted speed.


Data: Dave Pierson
Images, HTML: Mark D. Bej, M.D.
bejm@ccfadm.eeg.ccf.org
+216-444-0119
1996.10.12