The Victorian coalition on Tuesday pledged $1.7 billion to buy 25 new hybrid-electric trains for the Melton and Wyndham Vale lines.
Diesel V/Line trains are currently used to service the lines in Melbourne's west.
Former Victorian premier Daniel Andrews revealed plans to extend electric services to Melton and Wyndham Vale before leading Labor to a thumping election victory in 2018.
Almost eight years on, opposition public transport spokesman Matthew Guy said Labor's electrification plan was "never going to happen".
The coalition would proceed with electrification if it wins the November state election, but Mr Guy said the planned purchase of hybrid trains would provide suburban services in a "realistic time frame".
"Melton and Wyndham Vale are the fastest-growing growth corridors in Australia," he told reporters.
"We can't wait ... we need a solution that is soon, that is quick, that is affordable."
Four electric and diesel-powered regional trains are being tested on the NSW rail network.
The project to replace NSW's regional fleet with 29 bi-modal trains has been plagued by delays and cost blowouts.
Mr Guy said the coalition would aim to start delivering the trains by 2030 and they could run through either the City Loop or Metro Tunnel, depending on the manufacturer picked.
Public Transport Minister Vicki Ward claimed hybrid trains would not be able to go into the City Loop and described the opposition proposal as a "bizarre side quest".
"This appears to be a very ill thought out, expensive promise that doesn't deliver for Melton residents the modern electrified trains that they want," she said at the newly upgraded Melton train station, which opened on Tuesday.
"They want to be a part of the metro train system ... that's exactly what we're committed to doing."
In May, the Victorian and federal budgets included $152.7 million for preparatory works to electrify the Melton Line.
No completion date has been set for electrification of the line, with Ms Ward declaring she would not pre-empt the ongoing planning work.
"It's not about delayed promises," she said.
"It's about making sure that the processes are taken to enable electrification to occur and this is why the work is happening at the Sunshine transport superhub, which untangles six kilometres of track, allowing for those services."
Labor is desperate to retain its heartland western Melbourne seats of Melton and Werribee, where Liberal, One Nation and other minor party candidates are expected to poll strongly.
Senator Hanson continued her Victorian tour on Tuesday, hosting a private $2000-a-head fundraiser with business leaders at Melbourne's Vue de monde.
Former Victorian Liberal Party treasurer Andrew Abercrombie, One Nation Victorian leader Warren Pickering and the party's state secretary Bianca Colecchia were spotted entering the venue.
The location for the three-course lunch was kept tight, with attendees only provided the details for the midday event at 9am.
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