TEP60s are in rezerve, but there is a chance that they will be repaired. They let 2M62Ks probably because M62Ks doesn't fit to the timetable. On this video, 2M62K was on time
The speed limit of a loco, does not depend on its engine. The speed limit depends on loco construction, mainly bogies. All locos with those bogies havespeed limit of 100 or less