I did this one last weekend, aiming to get some N-class haulage.
My original plan was to take the Saturday morning Swan Hill train from Melbourne to Castlemaine then intercept the up Swan Hill back to Southern Cross, as
@Richard Scott is proposing.
I'd done a bit of research with online images of interiors of ACN cars (the declassified First Class) and V/Line's on-line seating maps to ensure I booked myself seats with a good view, not obstructed by the window pillars or curtains (curtains being a hang-over on V/Line from an earlier age).
At a late stage, I changed my tickets & seat reservations from Saturday to Sunday 15th to cover some extra rail-based opportunities. Still taking the morning Swan Hill train from Southern Cross, but now continuing on to Bendigo. Then a spin around the streets of Bendigo on their heritage tramway, a back-track move around lunchtime from Bendigo to Castlemaine in a VLocity unit, then a Sunday afternoon trip on the Victorian Goldfields heritage railway from Castlemaine to Maldon and back. On return to Castlemaine, it was along to the local Shedshaker Brewery for a feed and a beer or three in the evening sunshine, before catching the evening Swan Hill to Melbourne train around 19:30.
On Saturday evening I noticed a new disruption advice posted on the V/Line website - trains would be running as normal between Melbourne & Bendigo on Sunday, but the Bendigo/Swan Hill leg would be substitute buses. This wouldn't
necessarily affect my plans - but I wondered if truncated Swan Hill trains would mean neither N-class loco nor VN hauled stock for my jaunt.
This proved to be the case. With no need for trains to run beyond Bendigo (I don't think VLocity DMUs are approved from there to Swan Hill), V/Line didn't bother firing up a loco, or dragging the VN carriages out of the sidings that Sunday. They substituted a vanilla 3-car VLocity set instead.
It must have been a bit of a come-down for the longer-distance passengers on board too, many with substantial luggage in tow sporting tell-tale airline bag tags, suggesting arrival off a gruelling long-haul flight early that morning. Instead of a nice 5-car loco-hauled train through to your destination, with buffet car and reserved seating (in declassified First if you were smart), it was a 3-car DMU with underfloor engines, a bun-fight for unreserved seats & luggage space, no refreshments (for a 5¼ hr end-to-end journey) and one of the unit's two toilets locked "out of use". Then tipping out at Bendigo for Rail Replacement Buses.
Anyhow, apart from missing my chance for a last(?) trip behind a N-class loco, the rest of the day went well, and at AU$4.00
* (£2.10) for a whole day's travel, i can hardly complain. We passed the morning Up 'Swan Hill' (started from Bendigo & also a VLocity that day) halfway between the Castlemaine and Kangaroo Flat stops and an interception would have worked just fine.
If - as in Post #66 -
@Richard Scott plans travelling on 31st March (a Tuesday) there may be less chance of RRBs to Swan Hill than is the case at weekends.
And if you do find out on the day it's a VLocity vice N-class loco standing at the platform, you can easily get a full refund on a paper ticket if you get to the V/Line booking office before departure time.
* - $4 weekend daily cap with my Aussie Coffin Dodger's Card. The Goldfields Railway wasn't included, of course, and cost a lot more than $4.00!