Retarding barriers, red-green traffic type signals, and crossing bell, all controlled automatically by track circuits, were installed at Newmarket. N H, to replace gates; westerly barrier located 70 ft from nearest rail, while easterly barrier is 79 ft from rail; barriers each consist of two 10-ft sections, which extend entirely across 20-ft paved section of highway.
Barriers on Boston and Maine
Ry Signaling
Railway Signaling ; 31 , n 3
1938
3 pages
Article (Journal)
English
© Metadata Copyright Elsevier B. V. All rights reserved.
Engineering Index Backfile | 1938
Highway traffic retarding-barriers on Boston and Maine
Engineering Index Backfile | 1937
Boston and Maine electric locomotives
Engineering Index Backfile | 1911
Engineering Index Backfile | 1936
Boston and Maine steel coaches
Engineering Index Backfile | 1916