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Baltimore and Ohio

Baltimore and Ohio signals can be connected to the Signalist SC1 as in the below diagram. Full signal masts will require one and a hallf SC1s but this is unlikely to be required in most situations, instead the G and H or J and K marker lamps can be connected to terminals G and H without further configuration.

Full B&O colour position light signal connected to a pair of SC1s

Baltimore and Ohio position light signal wiring diagram


Partial B&O colour position light signal connected to a single SC1

Baltimore and Ohio reduced wiring diagram


Note that when using the CV38=8 configuration, flashing aspects can be achieved by toggling between the solid aspect and dark. Software such as JMRI will do this automatically.

B&O Rule

Description

CV38=72

aspect

CV38=67

aspect

CV38=8

1st addr

 2nd

addr

3rd

addr

 4th

addr

 5th

addr

 6th

addr

 7th

addr

 8th

addr

 9th

addr

10th

addr

292

Stop

0

0

R

N

N

N

N

N

N

N

N

N

291

Restricted proceed

1

3

R

N

N

N

R

N

N

N

N

N

290

Restricting

2

3

N

N

N

R

N

N

N

N

N

N

288

Slow approach

3

1

N

N

R

N

N

N

N

N

N

N

287A

Slow approach slow

4

2

N

R

N

N

N

N

N

N

N

N

287

Slow clear

5

6

N

R

N

N

N

N

N

N

N

N

286

Medium approach

6

 

N

N

R

N

N

R

N

N

N

N

285

Approach

7

 

N

N

R

N

R

N

N

N

N

N

284

Approach Slow

8

 

N

R

N

N

N

N

N

N

R

N

283B

Medium approach slow

9

 

N

R

N

N

N

N

N

N

N

R

283A

Medium approach medium

10

 

N

R

N

N

N

N

N

R

N

N

283

Medium to Clear

11

 

N

R

N

N

N

R

N

N

N

N

282

Approach Medium

12

 

N

R

N

N

N

N

R

N

N

N

281C

Limited to Clear

13

 

N

R

N

N

N

R

N

N

N

N

281B

Approach Limited

14

 

N

N

N

N

N

N

R

N

N

N

281

Clear

15

 

N

R

N

N

R

N

N

N

N

N

-

Dark

16

8

N

N

N

N

N

N

N

N

N

N

N=Normal or Closed, R=Reversed or Thrown

In JMRI use DCC Signal Mast Decoder for CV38=72, CV38=73 and CV38=67. For CV38=8 use Quad Output for the main head and single output for each of the six marker lamps.


Signal reference chart can be found at the Signals of the US website:- B&O PDF



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