Colour

Colour	Previously	Current	Notes
Yellow	Northbound services	Circle Line
Red	Southbound services	North South Line
		Tsuen Wan Line
		Marunouchi Line
Green	Eastbound services	East West Line
		Kwun Tong Line
		Chiyoda Line
Blue	Westbound services	Downtown Line	It was actually Circle Line first.
		Island Line
Sky Blue		Tozai Line
Orange		Tung Chung Line
		Ginza Line
Purple	North East Line northbound services	North East Line
		Tseung Kwan O Line
Light Purple		Hanzomon Line
Pink	North East Line southbound services	Cross Island Line	It was actually Thomson Line first.
Khaki	Northbound Choa Chu Kang Branch Line services	Jurong Region Line
Brown	Southbound Choa Chu Kang Branch Line services	Thomson-East Coast Line	It was actually Downtown Line first.
		Fukutoshin Line
Grey		Hibiya Line	It was actually Downtown Line first.
Gold		Yurakucho Line
Teal		Jurong Region Line
		Airport Express
		Namboku Line