Hi Mikhail, 2100 was a prototype (described as a ZP) for the rebuild project (the ZR Class) and was given a cab based on the Goninan/GE EL Class. Once evaluated, AN Tasrail decided to alter the design to a different cab design based loosely on the Clyde/EMD DL Class for the second locomotive (now known as 2101). Several more ZR rebuilds were supposed to occur, but AN Tasrail was sold to Wisconsin Central in 1997 and the project was cancelled with only the original ZP and ZR locos completed.