Terminology

Track Direction:

Up = Cheltenham to Broadway (north) previously known as the Malvern side

Down = Broadway to Cheltenham (south) previously known as the Cotswold side

Terminology:

Drainage work takes place 'lineside' or 'on or near the line' and cess drains run under the cess (see below):

Cess drains through stations and tunnels run under the six-foot, just to confuse things 😕

Toe drains are at the bottom (foot) of embankments

Crest drains run along the top (crest) of cutting slopes

Counterfort drains run down slopes to lower groundwater levels in soils to prevent slope instability.

Catchpit is the base below the outlet pipe of a chamber where the silt and debris in the water flow settles and is caught. Chambers can be made from brick, block, pre-cast concrete rings or a mix of all three.

Brick built chamber

Pre-cast concrete ring built chamber

Culvert (a tunnel that runs under a road or railway) is used in the blog a generic term for Culverts, Cross Drains and Bridges (classification depends on diameter) as follows.

Bridges can be brick arches, concrete or steel spans, see Culvert 21A below.

Culvert 21A up side (outlet) the River Isbourne at Winchcombe is a Bridge

Culverts can be brick arches or pipes or a mix of both, see the 2 pictures of Culvert 3B below (this has been extend on the down side with plastic twin-wall pipe).