Complex sentence: The 421 class can achieve a top speed of 115 km/h. They ride on Co-Co bogies, operate on standard gauge, are 18.91 m long and weigh 110 tonnes.
Split into simpler sentences: The 421 class can achieve a top speed of 115 km/h. They ride on Co-Co bogies and operate on standard gauge. They are 18.91 m long and weigh 110 tonnes.