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London North Eastern Railway Searchlight Signals


LNER style 3-aspect searchlight signal

LNER style 3-aspect mechanical searchlight signal



The London North Eastern Railway used colour light signals in several places on busy parts of the network most notably they are still in use on part of the former Great Eastern section. The signals are capable of displaying three or four aspects, Clear - proceed, Advance Caution - the next two blocks are clear, Caution - the next block is clear but be prepared to stop at the next signal, and Stop.

While this signalling was installed initially by the LNER in the 1930s installation continued under British Railways and is still in use today at Clacton on Sea. BR Western Region modified some of the Great Western searchlight signals to be of this type too on lines out of Paddington. The latest signals which are currently being installed by Network Rail are the LED equivelents of the LNER searchlights.

The SC1 can be configured for two LNER 4-aspect searchlight signals by setting CV38=4 (standard accessory protocol) or CV38=132 (extended accessory protocol). Four 3-aspect searchlights can be configured with CV38=8 (standard accessory protocol) or CV38=129 (extended accessory protocol). Each signal mast is controlled according to the following tables:-

LNER searchlight signal operation table for CV38=4 or CV38=5

Base

state

Base+1

state

Aspect

Normal

Normal

Red

Reverse

Normal

Green

Normal

Reverse

Yellow

Reverse

Reverse

Double Yellow




LNER searchlight signal operation table for CV38=8

Base

state

Base+1

state

Base+2

State*

Base+3

State**

Aspect

Reverse

Normal

Normal

Normal

Red

Normal

Reverse

Normal

Normal

Green

Reverse

Reverse

Normal

Normal

Yellow

Reverse

Reverse

Reverse

Reverse

Double Yellow

Normal

Normal

Normal

Normal

Dark

* For 3-aspect signals Base+2 is the feather pivot lamp.
** For signals with a single feather Base+3 is the feather.    
Flashing aspects can be displayed by toggling between the desired aspect and Dark


LNER searchlight signal operation table for CV38=129, CV38=131, CV38=132 and CV38=134

Aspect number

Aspect display

0

Red

2

Green

1

Yellow

3

Double Yellow

4

Flashing Red

6

Flashing Green

5

Flashing Yellow

7

Flashing Double Yellow

8

Dark


LNER searchlight signal wiring diagrams


4x 3-aspect wiring diagram

London North eastern Railway three aspect searchlight signal wiring diagram

2x 3-aspect with feather wiring diagram

London North eastern Railway three aspect searchlight signal with feather wiring diagram

2x 4-aspect wiring diagram

London North eastern Railway four aspect searchlight signal wiring diagram

2x 4-aspect with single feather wiring diagram

Four aspect searchlight with single feather wiring diagram

4-aspect with multple feathers wiring diagram

London North eastern Railway four aspect searchlight signal with feather wiring diagram

Several CV38 settings are possible:-
If using JMRI with standard accessory protocol use the BR-2003 signal system with the signal head controlled mast driver.If using JMRI with extended accessory protocol use the BR-2003 signal system with the DCC signal mast decoder driver.
Visit the JMRI BR-2003 signal system to see the available mast types.
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