01/08/1901 | Rhymney Valley Branch (Barry Dock and Railways) Tynycaeau Junction to Penrhos Upper Junction (with the Rhymney Railway) opened. Walnut Tree Viaduct opened. |
/ /1969 | Rhymney Valley Branch (Barry Dock and Railways) Walnut Tree Viaduct girders removed. |
/ /1973 | Rhymney Valley Branch (Barry Dock and Railways) Walnut Tree Viaduct piers demolished. One pier remains. |