The Cat equivalent is the 3516 or C175-20.
3500 is the series of the engine, or platform. The last 2 digit represent the number of cylinders.
3508 = 8 cylinder
3516 = 16 cylinder
3524 = 24 cylinder
C175 is a new platform introduced a few years ago. 175mm bore. Again the last 2 digits is the number of cylinders.
C175-20 is a 20 cylinder.
http://youtu.be/nSQi7hVXAH4I got to visit this Finning dealership in Antofagasta, Chile. That was an interesting trip. While taking a tour of the facility, they showed me this dyno room. At the time they weren't testing an engine though.
Where are these size engines used?
Marine - large pleasure craft, tugboats, small commercial shipping, fishing boats
Power generation - land based continuous and standby generators for large commercial and industrial buildings, and ship based generators
Industrial power - large air compressors, gas and oil line compressors/pumps, oil drill platform power
Heavy machinery - 797 mining trucks, mining shovels, EMD locomotives
http://www.youtube.com/watch?v=4WsALOARphU&feature=relmfuHow long do these engine last?
Of course I am biased, but I believe Cat is the industry leader on this aspect. The hours till overhaul on this size engine is in the range of 20,000 to 27,000hrs. For a mining truck running 24hrs a day 7 days a week, that is about 3 years of continuous running (stopping only for refuel, oil change, filter change, driver change, and other maintenance).
Cat's 3500 and 3600 engines are assembled in Lafayette, Indiana.
http://www.youtube.com/watch?v=4WsALOARphU&feature=relmfu