Walpole, Massachusetts

Diamond Pond Railroad Culvert (Norfolk County, Massachusetts)
Abandoned stone arch bridge over Diamond Pond on NYNH&H Wrentham Branch
Derelict/abandoned

MBTA - Neponset River Bridge (Franklin Branch MP 17.82) (Norfolk County, Massachusetts)
Built 1902
Deck plate girder bridge over Neponset River on MBTA Franklin Branch (MBTA Franklin Line)
Open to railway traffic

MBTA - Plimpton Street Railroad Bridge (Norfolk County, Massachusetts)
Built 1905 by Boston Bridge Works; 1 girder (1 track) removed later on
Pony/through plate girder bridge over Plimpton Street on MBTA Franklin Branch (MBTA Franklin Line)
Open to railway traffic, and to vehicle traffic below

Walpole Tunnel (Norfolk County, Massachusetts)
Built 1848 by original Norfolk County Railroad
Stone arch tunnel carrying MBTA Franklin Branch on under Main Street (MA 1A) in Walpole. Administered as a bridge by the State.
Open to railway traffic below, and to vehicle and pedestrian traffic above