pontoon : Idioms & Phrases
Pontoon bridge
- 
       noun a temporary bridge built over a series of pontoons
       
       
bateau bridge; floating bridge.
 
WordNet
- a bridge formed with pontoons.
 
Webster 1913
pontoon plane
- 
       noun a seaplane equipped with pontoons for landing or taking off from water
       
       
floatplane.
 
WordNet
Pontoon train
- the carriages of the pontoons, and the materials they carry for making a pontoon bridge.