Retromobile... wish I was there

https://www.facebook.com/RetromobileOfficiel/

the woody USO bus in Trinidad, 1930s

found on https://www.flickr.com/photos/striderv/albums

Steam tourist bus on the way to the Paris Expo

https://www.facebook.com/groups/yachtclubdesavionsdelaroute/?fref=nf

This is a Bollee steam bus with Muhlbacher body work, built in 1885.

 It could carry 16 people at a speed of 10 mph. It was built on the pattern of a "diligence" of the 1850s - that is, a substantially built coach with four or more horses that was the French version of a stagecoach. It weighed 15432.36 pounds. It survives today in the National Museum of the Car and Tourism in Compiègne in northern France.

 Thanks Steve!

http://www.forum-auto.com/automobile-pratique/modelisme-modeles-reduits/sujet9809-8575.htm
http://www.larousse.fr/encyclopedie/divers/r%C3%A9volution_industrielle/61047

Update Feb 17th

1885 Amedee Bollee Diligence du Marquis de Broc, an early 18-passenger, steam-powered bus. It stands as high as a two-story building, is driven from the above like a ferry boat, while the boiler and its smokestack is located amidships.
http://www.automobilemag.com/features/lists/10-coolest-things-at-paris-retromobile/

Greyhound 1940

Found on http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll170/id/91947/rec/73

mighty fine looking bus to take people to the hotel

http://waterandpower.org/museum/Early_City_Views%20(1900%20-%201925)_Page_2.html