Overhead wiring was still installed at the St Marys end of the branch where it turned off the main western line for approximately 10 cars to provide a terminating point for trains used on "Y" Link services.
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Its main purpose was to transport military ammunition's and munitions factory workers to and from St Marys during World War II.
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At Dunheved railway station, a fenced in compound was constructed on the down branch and down No. 1 siding, and 2 suburban train carriages were stored there for use by the NSW Fire Brigade for training purposes - Comeng motor car C3866 and Goninan Tangara car N5127.
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Between Boxing Day 1990 & 8 January 1991 a major trackwork shutdown that was between St Marys and Glenbrook, the line was temporarily reopened as far as Dunheved to allow suburban trains that normally stabled at Penrith to be stabled in the 4 track yard and on platform 2 or the Down Branch track.
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With the abolition of "Y" link services to St Marys in 2005, there was no reason for the overhead wiring and associated components to be left in place and they were subsequently removed.
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