Platform Bolt

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Platform
Roof
bolt

A platform bolt is a type of type of triangulation mark. It comprises a large concrete platform with a centrally-placed bolt. This may often be positioned in a hedgeline or raised field boundary. 24 instances are recorded in TP:UK, located in North Wales and South West England. In OSGB36 the mark is classified as a bolt but qualified as 'bolt in platform' in the comment field. Platform Bolts were re-used in the passive station era. All marks are of order 3.

T:UK Station name Order Computed Block
TP8098 Cae Hir 3 1956 SH62
TP8517 Gwydd Gwion 3 1956 SH62
TP7660 Corlan-Fraith 3 1956 SH62
TP8092 Garn Bodvean 3 1956 SH62
TP8229 Peppershill 3 1949 SS30
TP7643 Carcade Farm 3 1955 SX06
TP7644 Treore 3 1955 SX06
TP7647 Middle Taphouse 3 1955 SX06
TP7534 Burniere Farm 3 1955 SX06
TP7645 Grey Mare Hill 3 1955 SX06
TP7492 Castle Canyke 3 1955 SX06
TP7646 Beacon Hill 3 1955 SX06
TP7819 Trevollard 3 1955 SX06
TP8077 Torfrey Hill 3 1955 SX06
TP7684 Trenarren 3 1955 SX06
TP7533 Hendra Farm 3 1955 SX06
TP7490 Polstain Farm 3 1955 SX06
TP8098 Cae Hir 3 1956 SH62
TP8517 Gwydd Gwion 3 1956 SH62
TP7660 Corlan-Fraith 3 1956 SH62
TP8092 Garn Bodvean 3 1956 SH62
TP8229 Peppershill 3 1949 SS30
TP7643 Carcade Farm 3 1955 SX06
TP7644 Treore 3 1955 SX06
TP7647 Middle Taphouse 3 1955 SX06
TP7534 Burniere Farm 3 1955 SX06
TP7645 Grey Mare Hill 3 1955 SX06
TP7492 Castle Canyke 3 1955 SX06
TP7646 Beacon Hill 3 1955 SX06
TP7819 Trevollard 3 1955 SX06
TP8077 Torfrey Hill 3 1955 SX06
TP7684 Trenarren 3 1955 SX06
TP7533 Hendra Farm 3 1955 SX06
TP7490 Polstain Farm 3 1955 SX06
TP7682 Goviley Major 3 1955 SX06
TP7686 Polwhele Farm 3 1955 SX06
TP7685 Camerance Farm 3 1955 SW63
TP8075 Four Acres 3 1955 SW63
TP8073 New Downs 3 1955 SW63
TP8074 Wheal Mount 3 1955 SW63
TP8072 Hingey 3 1955 SW63