The image is from:
Modern Light Rail as a
transport solution for
large cities
Antero Alku, M.Sc.
E-mail: antero.alku@alkutieto.fi
www.kaupunkiliikenne.net
http://www.kaupunkiliikenne.net/Kirja/Modern%20Light%20Rail%20basics.pdf
Total ( capital plus operating costs) for bus versus light rail / tram
