NR NR/L2/SIG/11201/MOD X10 ISSUE 1 PDF

GENERAL DESCRIPTION.

The crossing is worked automatically by the passage of trains.

Protecting signals shall be provided within 10 minutes running time at permissible speed. This limit shall not apply in RETB or ERTMS areas where there is continuous voice communication between train and signal box or arrangements are in place for each train to contact the signaller and obtain permission before proceeding over the crossing.

Where a protecting signal is not directly controlled or slotted by the signal box supervising the crossing, arrangements shall be in place to alert the signaller controlling the protecting signal to replace it to danger quickly in an emergency.

NOTE In an absolute block area, then sending "6 bells" is sufficient. In other areas an emergency alarm or similar shall be provided.

Automatic half barrier crossings have barriers pivoted at the nearside of the road and of length up to the centre line of the road. The exit sides of the roads are kept clear to allow slow moving vehicles to clear the crossing.

Each road approach is protected by a minimum of two road traffic light signals (RTL's). One unit is sited on each side of the road approach.

Audible warnings are provided for pedestrians. There is a minimum of two units. They shall be normally sited at the diagonally opposite nearside corners of the crossing facing onto the crossing area. Larger crossings may use four audible warning devices with one at each corner.

A scaled ground plan defines and locates all equipment sited at the level crossing.

Telephones for users are provided. ( the normal system used at AHB crossings is the P.E.Ts system ).

The maximum length of trains permitted to operate over the level crossing shall be documented in the design details.