The main program:
http://sourceforge.net/projects/simutrans/files/Simutrans%20complete/102-2-2/simuwin-complete-102-2-2.zip/download
Pak128 (The most common pak set in Simutrans):
http://sourceforge.net/projects/simutrans/files/pak128/pak128%20for%20102-2-2/pak128-1.4.6--102.2.zip/download
Some Singapore Buses (pak128) :
SBS Scania K230UB: http://blog.qooza.hk/Simutrans?eid=21876894&mute
SBS Volvo B10TL Wright: http://blog.qooza.hk/Simutrans?eid=22078747&mute