As the railway system extended its tentacles, the colour coding became more pronounced.

For key stations, Mead says, different shades of red were used. The bold red in the Tsuen Wan, Mong Kok and Central stations was intended to alert passengers that they had arrived at an interchange or terminus.

In developing the colour coding, Mead says, the MTR Corp was careful to avoid using the same tone for successive stations. For instance, blue is the hue at Mei Foo, in sharp contrast to the red stations of Lai King and Lai Chi Kok.

However, it takes some lateral thinking to make sense of the colour used at a few of the platforms. Some were simply derived from the Chinese names of the stops. For example, the rainbow colours of Choi Hung station are a vivid example of the literal translation from Cantonese: choi hung means rainbow. Yellow is the colour of Wong Tai Sin station because the word wong means yellow. Lai Chi Kok station is a pinky red because lai chi means lychee. Prince Edward station is purple because it’s commonly associated with royalty in Britain, the city’s former colonial ruler.

The architects also used a variety of colours to creatively convey the meaning of names at certain stations. An example is Diamond Hill. The tiles plastered on the walls and pillars at the station are mainly black, but dotted with small white tiles to produce the sparkling effect of a diamond when seen from different angles.

Other stations were designed using colours that take into account the local environment.

“Whampoa station is blue because it’s close to the water. Ho Man Tin station is green because it’s a part of the hill, and that’s really how that colour was chosen. Nothing’s really more sophisticated than that, and this makes it distinctive,” Mead says.

The MTR Corp broke with tradition, however, in the design of stations along the Airport Express, which are a more subdued grey. That’s because the company regards it as an extension of the airport, Mead explains. Norman Foster, the British architect who designed the airport – and the HSBC Building in Central – is not known for his use of colour. In fact, in the industry, Mead says, architects often refer to “Foster grey” because it’s his preferred shade for most of his projects.

So MTR architects decided to capitalise on this distinct colouring – or lack of it. “The Airport Express, Kowloon and Hong Kong stations are all the same grey,” Mead says. “As soon as you go to Kowloon station, as soon as you go to Hong Kong station, you feel like you are at the airport. It’s the extension of the airport from Lantau into the city.”

However, the Airport Express is not all grey. There are splashes of colour in works of art the

architects integrated into stations, blending colour and functionality.

Mead cites local artist Gaylord Chan’s work, Swift and Safe – picturing a rocket in space – between the Hong Kong and Central stations, as an example. He says the piece is all about the movement of people, and people passing by at speed, which reflects the passage’s function as a transit area.

Meanwhile, Mead says, a diverse collection of art has been added to older stations. That includes the chubby bronze ballerina sculptures by Chinese artist Yin Zhixin at Choi Hung station – one of the oldest. A brighter example is Ng Yuen-wa’s Life in Mei Foo – Now and Then, in Mei Foo station. Its 16 vividly painted panels depict the lives of the neighbourhood’s residents, enjoying the Mid-Autumn Festival, spending time in a park or just relaxing at home.

“These are all curated. It’s not just about picking a nice picture; it’s about making sure it resonates with the people going through,” Mead says.

For the newer stations, the MTR Corp is starting to integrate art and colour in a more sophisticated way, he says.

For example, at Ocean Park station – set to open on December 28 along with the rest of the South Island Line – different shades of blue have been used because it’s the colour that most obviously represents the theme park. However, there is also a chrome-plated sculpture depicting a school of fish. The design of the station represents the sea, and the creatures at Ocean Park, but it is also functional. By following the movement of fish pictured on the walls, visitors can find their way to the exit or the platforms, Mead says.

Such functional artwork and meaningful colours are integrated so seamlessly on the MTR, though, that you’d be forgiven for not noticing them.