the "class 642" has two man diesel engines with an output of 275 or 315 kw each and hydro-mechanical transmission with retarders. it normally has 100 seats. when linked together with scharfenberg couplers, up to three trainsets can be worked together. the desiros are quite popular with most passengers, thanks to their good acceleration. because they have often replaced push/pull trains, their shorter journey times, such as on the "müglitzbahn", have made greater passenger numbers.