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9.4.1 Construction materials
a. General
Aboveground trainways shall be constructed of non-combustible materials.
b. Fire resistant rating
The elements of structure for aboveground trainways shall have a fire resistance of at least 2 hours. Test of fire resistance shall be in accordance with Cl.3.4.
c. Cover board
Cover board or any protective material used to provide safety isolation from the contact traction power rail shall have a flame spread rating of not less than Class 1 as specified in Cl.3.13.3 when tested in accordance with BS 476: Part 7.
9.4.2 Setback distance
Setback distance between trainway structure and adjacent building
a. The setback distance between the proposed trainway structure and the adjacent building shall comply with the distance stipulated in Annex 3B based on the extent of unprotected openings in the external wall of the adjacent building, using the outermost edge of the proposed trainway structure as the relevant boundary, or at least 6m clear of the outermost edge of the proposed trainway structure, whichever is greater. See Diagram 9.4.2a..
b. For proposed trainway located outside the development boundary of a private development, the distance between the adjacent building(s) and the outermost edge of the proposed trainway shall be at least 6m. See Diagram 9.4.2b..
c. Measurement of setback distance
The setback distance shall be measured from the edge of trainways to the external wall of the adjacent buildings.
d. Enclosing rectangle
The height of the enclosing rectangle used in the calculations shall be measured up to the height of the trainways.
9.4.3 Emergency access
a. General
Emergency access to the trainways shall be provided.
b. Access to trainway
Access to trainway shall be from the station or via the firefighters’ mobile ladder or equipment from roadway adjacent to the trainways. If no adjacent or crossing roadway exist, access roads at a maximum 800m intervals shall be required. The design of the fire engine access road shall be similar to that of the fire engine accessway stipulated in Chapter 4.
c. Security fences for trainways
Where security fences are used to secure an area along the trainways, access gates of at least 1m wide shall be provided. Information that clearly identifies the route and location of each gate shall be provided on the gates or adjacent thereto.
9.4.4 Egress for passengers
a. General The RTS shall incorporate means for passengers to evacuate a train at any point along the trainways and reach a point of safety. System egress points shall be illuminated. b. Emergency pathway An emergency pathway of minimum 800mm width shall be provided along the trainways. Unobstructed access, such as steps or ramp, shall be provided at cross-over trackway c. Trainway concreted track bed Where the trainway concreted track bed serves as emergency egress pathway, it shall be nominally level and free of obstructions. Where signalling equipment is located along the emergency egress pathway, ramp and platform shall be provided. The edges of the ramp and platform shall be painted with bright yellow paint to enhance its visibility
