chuff 2 
(chŭf)
(chŭf)intr.v. chuffed, chuf·fing, chuffs
To produce or move with noisy puffing or explosive sounds: "Switch engines chuffed impatiently in busy rail yards" (Robert Paul Jordan).
n.
A noisy puffing or explosive sound, such as one made by a locomotive.
[Imitative.]