these h sets were based on the M set design, with manufacturing been done at the UGL rail manufacturing facility at broadmeadows.and was the newest generation class for cityrail, then passed onto nsw trainlink.operating on the central coast/ blue mountains lines/Illawarra line. so with the introduction of the NiF sets due to replace the H sets & V sets very soon. this could soon allow the H sets to run Suburban which would probably be on The T4/T9 or T1 line. the onboard toilets would soon get removed of these Oscars & get converted to a suburban set.