The policy could be here to stay with commuters being encouraged to ditch their cars in favour of taking the train.
Spain has just extended its free train travel scheme through to December 2023.
Earlier this year, free train tickets were introduced for short and medium-distance journeys. It started on 1 September and was originally meant to end on 31 December.
Now, the country's Minister of Finance María Jesús Montero has pledged €700 million to extend the scheme until the end of next year - and it could be here to stay for the foreseeable future.
"We are going to convert this policy into a structural one and we will see the concrete results of public transport to reduce CO2. It is a priority policy in the coming years," she said.
The environmental and social impacts of these free multi-trip tickets will be reevaluated then to see if it is worth continuing with the scheme.
The Minister of Finance added that free travel had already made it possible for a large number of citizens to abandon their cars and travel by train instead.
How can you get free train tickets in Spain this autumn?
The scheme, announced by Prime Minister Pedro Sánchez on 12 July, applies to short and medium-distance trains run by the national rail operator Renfe. It is open to all nationalities, including international tourists.
Free tickets are available on all Renfe commuter trains (Cercanías and Rodalies) and mid-distance regional lines covering journeys of less than 300km (Media Distancia routes).
The 100 per cent discount is only available on multi-trip tickets, not singles. Travel on other services, including long-distance trains and those operated by other companies, will not come under the measures.
This could mean free train travel between cities like Barcelona and Seville or Madrid and Bilbao - if you are willing to commit to buying a season ticket.
Although the tickets are free, a deposit of €10 or €20 is required to take advantage of the offer. You must have made at least 16 journeys by the end of December for this to be refunded.
A 50 per cent discount on Renfe train tickets was already introduced in June in an effort to help out commuters.
But, after reviewing the financial state of the country, Prime Minister Sánchez decided to make journeys completely free for a certain period.
Why is Spain making train travel free?
These free train tickets are aimed at reducing the impact of the cost of living crisis in the country.
Germany introduced a similar measure between June and August with a discounted nationwide public transport pass. It gave travellers unlimited use of local and regional services for just €9 a month.
But Spain has decided to go one step further by making train travel on its Renfe services free between September and December this year.
“I am fully aware of the daily difficulties that most people face. I know that your salary is getting less and less, that it is difficult to make ends meet, and that your shopping basket is becoming more and more expensive,” Sanchez said.
“I am going to work my skin to the bone to defend the working class of this country.”
Why has Spain changed the way tickets are booked to avoid 'ghost reservations'?
In September, Spanish rail operator Renfe changed some of the terms and conditions to avoid "ghost reservations."
After the scheme was introduced, passengers began taking advantage of the system by booking multiple reservations at different times. As the trains are now free, it meant that they didn't incur any financial penalties for not using the trips they had booked.
These "ghost reservations" caused trains to look like they were completely full up to ten days in advance. Renfe has faced backlash from commuters who couldn't book a seat but were seeing their usual service leave half empty from the station.
Now the Spanish rail operator has limited passengers to two outgoing and two return journeys in an attempt to prevent the problem. The Renfe app also won't allow travellers to book the return part of their trip until their outgoing train has set off.
Spain's windfall tax is funding the subsidised travel
The free rail tickets will be funded by a new windfall tax on banks and energy companies that have profited from rising interest rates and energy prices.
The new levy is set to be introduced in 2023 and could generate up to €7 billion in two years.
It will also be used to build 12,000 new homes and fund youth scholarship programmes.