Structure / Site Summary for 273310

Bridge SAC/223 - Helm Tunnel


Key details from the SCRCA Structure Record

Brief description: Bridge SAC/223 - Helm Tunnel

Assessment status: Assessed

Location 1 - Rail-miles: 273

Location 2 - Chains: 25.50

Location 3 - Position relative to main running lines (tracks): Above

Is a structure of this type shown at this location on the MR 1911 landplan?: Yes

Construction / installation period: MR-C

Current Use: Railway ops

Visibility: Not-visible

Accessibility (ease of access): No Access


Primary / Secondary References

Plate 132 is a context view of the north portal of Helm Tunnel.

Built between 1870 and 1873 it is 571yds in length and was cut through red marl. It has stone side walls, invert and faces, and a brick arch was provided.

Attention is drawn to the position of the nameboard which has 4in cast letters on a 2ft 9in x 1ft 9in cast iron plate, mounted on recovered and machined sleepers with a finished size of 11in x 5in.  In this image the top of the plate stood 6ft above ground level.


Notes / additional information

For the purposes of the SCRCA Project, the 'tunnel' (structure type BT) is the underground structure between, but not including, the two tunnel-mouths / portals (which are structure type TM). The approximate mid-point of the tunnel is used to determine its geographic location. The following structures are directly associated with this tunnel:
      273150: Helm Tunnel South Portal (Bridge No 223)
      273480: Helm Tunnel North Portal (Bridge No 223)


Structure Location Map

Tips: This structure is located approximnately at the centre of the map below at the pointed end of the red marker. To adjust the scale of the map, either click on the [+] and [-] buttons (if Google has displayed these in the top-left corner of the map) or double-click your mouse buttons anywhere in the map area: left button = [+] = zoom-in, right button = [-] = zoom out). To 'pan' (move) the map, hold-down the left mouse button, then move the mouse. To open an information bubble containing brief details of the structure, left-click on the red marker. Please note that the position of the marker is approximate because Google keeps moving the map (yes, really!).

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