For most of Barcelona’s residents, the Metro is a bustling daytime artery, moving millions of passengers from 5:00 am until midnight. However, as the last train pulls into its depot, a different kind of rush hour begins. This is the “unseen Metro”, where an army of cleaners works against the clock to restore the network before the city wakes up again. This essential Barcelona Metro cleaning operation ensures the system remains hygienic for its 480 million annual passengers.
Transports Metropolitans de Barcelona (TMB) has shed light on this immense nocturnal operation. It reveals that 800 cleaning professionals maintain the system, with 80% of them working the graveyard shift.
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Home » Barcelona Metro Cleaning: The Night Operation Keeping Trains Spotless
The Unseen Barcelona Metro Cleaning Night Shift
The window for comprehensive cleaning is tight. Between midnight and 5:00 am, approximately 640 workers descend into the tunnels, stations, and depots. Their goal is to ensure the network remains hygienic for the 480 million annual passengers who rely on it.
According to TMB, this rigorous schedule is a key reason why users consistently rate the cleanliness of the network highly. In the most recent Customer Perception study, passengers awarded the cleanliness of trains a score of 7.9 out of 10, and stations a 7.8.
“It is a task unknown to users, but essential,” said Laia Bonet, President of TMB. She noted that the operation guarantees hygiene standards that match the system’s growing demand.
A €200 Million Modernisation Plan for Barcelona Metro Cleaning
To sustain and improve these standards, TMB has put out a tender for a new Barcelona Metro cleaning contract covering the period from 2026 to 2031. The global budget sits at €200 million, making it one of the operator’s most significant ongoing costs after the purchase of new trains.
The new contract is comprehensive. It covers conventional metro lines, the Montjuïc funicular and cable car, the Tramvia Blau, and sections of the L9 and L10 lines. Crucially, it also accounts for the future expansion of the L9 line, with new stations expected to be fully functional by 2028.
Robots and Sustainability in Barcelona Metro Cleaning
Gone are the days of the so-called “water brigade”, where teams would haul buckets of water manually. The modern Barcelona Metro cleaning strategy relies heavily on automation and sustainability.
The new contract emphasises environmental efficiency, targeting an 80% reduction in water consumption-saving approximately 2.7 million litres annually. This is achieved through the use of advanced autonomous machinery, likely aided by the recent recovery of Barcelona’s water reserves. For instance, at the modern Vall d’Hebron station (L5), a machine resembling a giant Roomba cleans the platforms without a driver, although it includes an optional seat for an operator.
Furthermore, the use of chemical products is being reduced in favour of more sustainable alternatives. Meanwhile, deep cleaning frequencies for hard-to-reach areas like ceilings and corners are set to increase.
Logistics of a Deep Clean
The scale of the task is staggering. The Vall d’Hebron station alone has 18,000 square metres of surface area to maintain, including vestibules, platforms, and street access points. Dedicated teams of ten people work along each line, aiming to perform a full “integral” clean of every station at least once a month. Smaller stops like Liceu might take a single night, while larger hubs require multiple shifts.
The cleaning protocols are specific and varied:
- Track yards: The visible track area and the first 15 metres of the tunnel are cleaned fortnightly (or weekly in leisure zones) to remove debris.
- Station exteriors: Pressure washers are used on outdoor stairs, which suffer the most from exposure to the elements.
- Trains: Interiors are cleaned daily, often at terminal stations during the day or in depots at night. Exteriors are washed in dedicated tunnels; the modern facility at Bellvitge (L1) washes six trains a day.
Xavier Flores, CEO of TMB, summarised the philosophy behind the massive investment: “The cleaner it is, the less it gets dirty.” Therefore, this simple maxim keeps hundreds of workers busy while the rest of the city sleeps.
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