What is a UTX?

At a glance

A duct (or set of ducts) running under the tracks so cables can get from one side of the railway to the other without crossing over the rails.

Why: Cables can't be laid across the track, so any route change of side, or a feed to equipment on the far side, needs a crossing under it.

Where: Wherever the cable needs to change side: to reach a node or housing on the other side, at junctions, or to swap to the better route side. Check the capacity of existing UTXs before boring a new one.

Where the rules are

NR/GN/TEL/30139 cl 6.10.3checking existing UTX capacity, S-type UTXs, boring new ones
NR/GN/TEL/30140 cl 4.11the civils standards that apply to under-track crossings
NR/GN/TEL/30140 cl 4.3.6DI-SAC through UTX/URX manholes
NR/L3/TEL/30108 cl 5.3.4pulling cable through ducts and UTXs

What to order

Duct bung 110 mm, reusable · Netceed · TDUX-100-INT
TDUX Inflatable Duct Seal (Single) 75-110mm Duct · 830709 (TDUX-90-INT)

PADS numbers with free sign-up on each part page. More in the parts finder

On the drawing

SLD symbol: UTX (grey filled square) — UTX (grey filled square) · Opstel SLD pack (free Visio stencil)

Shown on the SLD and route drawings at its position, and recorded in the survey with its capacity.

NR/GN/TEL/30139 cl 7.8.5FTN items to show on the drawing, incl. UTXs

Also called: under track crossing, under-track duct, URX (under-road crossing) is the road version

Guidance in our words. Read the current issue of each standard before you design to it.