Examples
Many of the stations on the Great Central Railway (now closed) were constructed in this form. This was because the line was planned to connect to a Channel Tunnel. If this happened, the lines would need to be compatible with continental loading gauge, and this would mean it would be easy to change the line to a larger gauge, by moving the track away from the platform to allow the wider bodied continental rolling stock to pass freely while leaving the platform area untouched.
In Toronto, 29 subway stations use island platforms (a few on the Bloor line and namely in the newer stations, a few on the YUS line and all of the Sheppard Line) and one station on the Scarborough Rapid Transit line (Scarborough Centre).
In Sydney, on the Eastern Suburbs Railway and the Epping Chatswood Railway, the twin tunnels are widely spaced and the tracks can remain at a constant track centres while still leaving room for the island platforms. A slight disadvantage is that crossovers have to be rather long.
Read more about this topic: Island Platform
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