How many people have sat on your couch? For Matthew McCallum, it could easily be in the millions.

The 30-year-old has transformed a seat from the vintage Glasgow subway trains that were retired from service last summer.

The Metro-Cammell trains made their debut in 1980, and the subway earned the nickname Clockwork Orange because of its striking orange-colored carriages.

However, they were slowly discontinued and substituted with new modern vehicles that are accessible for wheelchairs.

A legacy carriage was relocated to the Riverside Museum in Glasgow for inclusion in its transportation display, while other carriages were either dismantled or offered for sale.

Matt managed to purchase one of the vintage seats listed on Facebook Marketplace for £150.

"I've likely occupied this couch at some point, just like many others have," he remarked.

"It's a charming piece of design history right in your apartment."

The architect hailing from Bishopbriggs in East Dunbartonshire mentioned that he picked up the seat without having a clear idea of how he intended to use it.

"I imagined they could make for an interesting armchair," he remarked. "However, without a workshop at my disposal to create my own frame, I began considering a frame that I could repurpose."

"I found some Ikea couches that match the style, so I kept an eye out for a second-hand one and ended up purchasing it for around £80."

"I started with a three-seater, trimmed it down to the right dimensions, and after some experimentation, I finally got it functioning properly."

He attached the seat to the frame using some of the original hardware as well as some new parts from B&Q.

Nonetheless, certain aspects of the upcycling project involving the 44-year-old seat proved to be a bit more challenging.

A major task of the project involved removing years of accumulated grime from the seat.

When he initially gathered it, Matt remarked, "Each time I laid my hands on it, my fingers would be dusted in soot."

"When I pull back the velcro on the back, a few specks of soot come out, so I’ll have to keep cleaning it until I’m satisfied."

The Glasgow subway commenced operations in 1896 and underwent renovations in the 1970s, introducing the iconic orange carriages.

They were formally launched for passenger operations on April 16, 1980.

The railway manufacturer Metro-Cammell produced 33 subway carriages, and in 1992, an extra eight carriages were constructed to ensure that all trains consisted of three carriages each.

Last year, Stadler Rail, the contractors, listed the old carriages for sale at a price of £5,000 and decided to forgo the fee for charitable organizations.

They were welcomed by childcare facilities, an art studio, and a restaurateur.

In June, Glaswegians bid an emotional farewell to the carriages they had grown accustomed to for decades.

Matt remarked, "There's a certain charm in having the precise item displayed in your living room. It conveys a narrative."

"These seats have been in use for decades, highlighting their durability and resilience."

"This type of material, known as moquette, is selected for bus seating and transportation due to its durability, strength, and ease of cleaning. However, I've taken a carpet cleaner from my mother and have been working on it until I'm satisfied with the results."

Anna Campbell Jones, an interior designer and judge on "Scotland's Home of the Year," created the seating pattern for the legacy trains.

The antique chairs are upholstered in 100% mohair and adorned with Scottish leather.

Matt mentioned that he typically sought out unique second-hand furniture.

"There's an overwhelming amount of low-quality products produced in factories and then sent off to major suppliers for exorbitant prices," he remarked.

"However, I take great pride in the lovely items we've gathered for our apartment from charity shops and Facebook Marketplace."

"I enjoy the thrill of the chase, and it's rewarding to rescue items that would otherwise be discarded on the street or thrown into a landfill."