[Mobhack]

Trying a quick 30 second search on unit names with Mobhack gives various possibilities.

Which of the 3 different 121s are you looking at? [30,355,357] or which of the 3 different 122s [31,356,358]?.

All different units, with different non-overlapping service dates, but the same name. One does stop in 99, but the others each come into service later. Thus - one can buy these things past 1999.

Cheers
Andy