The Punkin' Vine - Signaling

NW Mailing List nw-mailing-list at
Tue Jan 21 10:06:03 EST 2014

For anyone who cogitates about such worthless old matters...

1. When was the first automatic block system installed on the Punkin' Vine? Years ago, I heard 1926-1927 mentioned as the time period. Anyone have information?

2. Did the initial installation of automatic block signaling on "the Punk" use the AC track circuits with which the N&W was so much in love during time time period?

3. Where was the first use of Absolute Permissive Block signaling on the N&W? (A possible clue: APB was invented in 1910.)

-- abram burnett

Sent to you from my Telegraph Key...

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