Cover image for Train operation by signal indication. I. The two principal methods of directing train movements. II. Directing train movements by signal indication.
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-
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