Merc1107 wrote: ↑Fri Feb 24, 2023 7:41 pm
bullswool wrote: ↑Fri Feb 24, 2023 6:34 pm
There's nothing stopping them running on the branch - but they operate at a max speed of 110 so would struggle to run to timetable.
They did operate W patterns on the Mandurah/Joondalup lines for years, which have a lot more high speed running between stops. Although I'm not sure if the timetables accommodated their lower top speed (or if 20km/h in brief stints is really a huge journey time blowout).
Originally (2004-2005) it was the other way round - the A series ran the full length of Clarkson to Armadale while the Bs were confined to Whitfords. Despite the transition to the B series in the following years, the 32 minute journey time from Clarkson to Perth has remained unchanged to this day off-peak and has been lengthened to 33 minutes in the peak direction (presumably to account for longer dwell times). Meanwhile the Whitfords shuttle has slowed from 17-18 minutes (with the A series in 2003) to 19-20 minutes, but now has an extra stop at Greenwood. Although, AFAIK the 110km/h limit still applies as far north as Currambine so it makes sense that there would be little change overall.
Butler also saw the A series a few times a day in the first year or so (from memory the 05:30 ex-Perth was one of them), and likewise there's been no change to off-peak travel times since the Bs exclusively took over, while peak direction trips are again one minute slower.
As for Mandurah here's the timetable from March 2009 (before the second-gen B series order entered service):
- Mandurah Line T 1Mar2009.JPG (67.42 KiB) Viewed 289 times
- Mandurah Line F 1Mar2009.JPG (59.91 KiB) Viewed 289 times
The K pattern had a minute slack inserted between Kwinana and Cockburn Central, while the outbound express leg ran a minute slower than the all-stops equivalent so I think it's clear that the timetable was built with the As in mind back them. Also the 05:30 from Perth and the 06:34 from Mandurah took an extra three minutes so presumably were also run by an A series - the original 2007 timetable had both at the normal 50 minutes but this was adjusted pretty quickly on the inbound trip. Meanwhile the W pattern was sped up from 19 minutes to 18 minutes off-peak in early 2016, although the A series seemed to have no trouble fitting in with the new timetable until there were enough B series trains to fully take over.