well for one its a six cylinder engine and i don't know exactly but i think it should be around 60, if not it should be over 50. now the hydra power is part of the shifter. the tractor has a standard 6 forward and 2 reverse gears but with the hydra power it reduces the speed in each gear which turns the tractor into a 12 forward and 4 reverse, i believe it is similar to an AC power director. it has open hydraulics, meaning oil is always flowing, they're good but if you are using some big stuff with them they lose power,but since this is a 1550 i doubt you would do anything real heavy. it has a cast iron front grill and the engine seperate from the frame. its hard to explain everything about these so what exactly do you want to know about these tractors?