By Geo. Richards, before the New England Railroad Club. Discusses the development of switches and frogs, and gives the qualities of a good safety switch.
Railroad track safety switches and frogs
Mast Mech
1888
Article (Journal)
English
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Railroad track frogs and switches
Engineering Index Backfile | 1891
|Railroad track frogs and switches
Engineering Index Backfile | 1888
Railroad track frogs and switches
Engineering Index Backfile | 1888
|Railroad track frogs and switches
Engineering Index Backfile | 1888
Railroad track frogs and switches
Engineering Index Backfile | 1891
|