However, of the five million Brits that are eligible for the card, only 10,000 cards were made available to the public.
In the frankly weird terms and conditions, Virgin Trains stipulates that: "You must always carry and be able to show your #Avocard while on your journey and when asked by rail staff, you must show a valid ticket and valid #Avocard".
The brand, which developed the stunt in-house, took to social media last night to promote the offer.
The Government's new "Millennial Railcard" for passengers aged 26 and 30 was launched on Tuesday but the initiative was called a "shambles" after the website crashed.
Announcing the scheme on its website, Virgin wrote: 'Did you miss out on the chance to get your hands on the 26-30 railcard?
'Introducing the #avocard, our very own temporary railcard'. It's a joke, but one that comes with real benefits. Please bear with us, we've got the whole team working on it'.
Customers aged between 26 and 30 buying tickets for journeys with Virgin Trains on the West Coast from today until midnight on 20th March can qualify for the same discount as offered by the 26-30 railcard, so long as they bring along a vital ingredient... the millennial staple; an avocado.