Train operation by signal indication. I. The two principal methods of directing train movements. II. Directing train movements by signal indication.
Title:
Train operation by signal indication. I. The two principal methods of directing train movements. II. Directing train movements by signal indication.
Author:
Sperry, Henry Muhlenberg, 1861-
Personal Author:
Publication Information:
New York : H. M. Sperry, 1920.
Physical Description:
1 pages l., 28 pages : frontispiece, illustrations ; 27 cm
General Note:
"First published in the Railway age of June 4 and June 11, 1920."--p. 3.
Lettered on cover: Bulletin no. 3.
Language:
English
Format :
Book