Illustrated detailed description. (400 w.)
McPherson's safety switch and frog
R R Gaz
1896
Aufsatz (Zeitschrift)
Englisch
© Metadata Copyright Elsevier B. V. All rights reserved.
Parsons block and interlocking railroad switch system and continuous rail frog
Engineering Index Backfile | 1889
Parsons block and interlocking railroad switch system and continuous rail frog
Engineering Index Backfile | 1889
Engineering Index Backfile | 1892