Bristol Line track circuits

[NW Mailing List]

Mr. Ben Blevins wrote: 

"The Bristol Line had DC track circuits after the 1946-47 signal upgrade. 
So, they were changed over during the signal upgrade. They were steady 
voltage DC circuits. They remained in service, with modifications through 
the years as sidings were removed, until 1996-97 during the pole line 
elimination. " 
.................................................................................................. 

Okay, Ben. Job well done! 

And your next assignment is to build a catalog of information on what types of track circuits were used in other places on the Narrow & Weedy Ry (as Mr. Smith is said to have once called it.) You have until the end of the semester to complete this project... 

Isn't it interesting that the N&W would install steady-energy DC track circuits in its 1946-1947 Bristol Line CTC project, when Coded DC and Coded AC track circuits had been proven superior a full decade beforehand...? And the Bristol Line CTC job was no "do it on-the-cheap" project, witness the fact that they paid to get code-line OS indications at every single automatic signal, in addition to the interlockings ! One wishes he could, just for a day, live inside the heads of the honchos who were calling the shots in the Signal Department during that period ! 

-- abram burnett 
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