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Fig. Island Platform Arrangement. VT Arrangement for ref only
The Island or Centre Platform is a classification when the tracks & trains are located on both side of the common platform. From a design, operation, safety, security, maintenance perspective, this platform type will be the best.
Let's break this down for further discussion:
Design & passenger wayfinding
Number of VT to concourse is shared for two tracks, so in island platform the overall numbers will be lower than a side platform. Which means Lower capital and operation cost
Passenger way finding is easier. Passengers have limited decision points after they egress from the trains, they have to go up to the concourse level (Upper right figure). Unless there are numerous concourses, and the decision point needs to be made at the platform, on the destination (Lower right figure). The former makes the
Fig. Platform to concourse over
Fig. Platform to remote concourse to Entrance.
Cross platform transfer is far easier, as passenger can change from left to right platform seamlessly, if operationally required, as in interchange station.
Ref platform fig above, island platform layout will provide larger space for a more efficient plant room arrangement, compared to a side platform
Services Arrangement for such platform is more efficient as they are centrally located and can ve connected to plants at the ends of the platform and the concourse above
Safer in certain system, as platform is larger, view across platform is possible and CCTV surveillance is far more effective.
Statutory compliance is also easier as number of VT capacity for egress is less, services, etc. for life safety can all be shared, etc.
Reduced operational maintenance, for all the reasons stated above, plus the overall volume of the station will also be lesser, which will require less energy and associated cost.
Architectural expression will be easier to render in systems where a larger void can manifest a more iconic space
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