"Kedeng Kedeng" is, according to a Dutch song, the sound a train makes driving on tracks. 

A "Draisina ferroviaria" is a vehicle that is used on the track to transport a small team of railway workers to a workplace. Long ago that was a hand-operated cart, then something motorized came. And in the latter category this thing that is based on a Fiat 600T belongs:

850T spoorweg 2

850 Draisina

They were also produced based on the Fiat 850T:

850T draisina

Just too nice not to show. More information on this site