A woman who 'married' a train station claims it was the 'happiest day of their lives' after 36 years of being 'in love'.

Carol Santa Fe takes a 45-minute bus ride every night to spend time with the Santa Fe train station, which she refers to as 'Daidra' and claims to have been in love with since she was nine years old.

"We didn’t start a relationship until 2011 but I had been in love with the station since I was a young girl," Santa Fe tells Metro.

"When we got married, I stood there and I told her that I take it as my partner. It was the happiest day of our lives."

This is not a legal marriage. The 45-year-old identifies as an 'objectum sexual' — someone who is sexually attracted to inanimate objects.

While she says she does not "have physical sex with the station in public", in order to be "respectful", she often has 'sex' with the building in her mind.

Santa Fe was previously in a relationship with a man, but now claims the station, which she describes as "romantic", is the love of her life.

She adds, when she visits the station, she walks around the building trying not to let anyone notice she is talking to it and discretely touching and rubbing up against the walls with her clothes on.

"When I’m touching her, I feel as though it actually holds me and kisses me... I especially like when I hear the trains rev up their engines – it turns me on."

The two first "consummated" their love a few years ago, when she came close to an orgasm after rubbing up against the wall, but became scared staff would catch her, she says.

Santa Fe describes herself as a "closeted objectum sexual", explaining she is scared she will be banned from seeing Daidra after what happened to Erica Eiffel, a woman who famously married Paris' Eiffel Tower but was banned after she was caught kissing and straddling the iconic structure.

However, Santa Fe says she is not ashamed of the relationship.

"Daidra has been the most stable partner I have ever had. I have had the time of my life being her wife," Santa Fe says.

"I can never leave San Diego, because my lover is here. I could never love another train station – she is the one."

Santa Fe, who volunteers as a support worker, claims objectum sexuality is like any other sexuality. However, there is debate over whether it clarifies as a mental illness or a sexuality.