|Sub-optimal layout for Petrie.|
Typically, where two train lines merge, it is best practice to allocate a separate platform for each train line. Using a separate platform for each line allows for more operating margin and reliability, as trains can wait for their turn on the merged track at the station platform. Instead, Petrie will have a shared platform. The shared platform will result in trains entering the merged track approx. 2.5 mins apart (due to station dwell time), instead of approx. 1 minute apart (on yellow signals) for separate platforms. The shared platform will increase the occurrences of trains waiting outside of the station if the train arrives early, or a train from the other line arrives late.
|An optimal design in Barcelona Source: http://carto.metro.free.fr|
Unless the publicly available plans are an incorrectly drawn "artists impression", then the track and platform layout at Petrie requires an urgent rethink. There should be separate platforms (preferably an island platform) for inbound MBRL and Caboolture Line services.
MBRL TMR Webpages:
Carto Metro Free (excellent track maps):