Hi all,
Well, I don't have a "personal" collection, since the great part of it belongs to my father (who actually has changed to the larger and quite more expensive Spur1) and some items are my girlfriend's [:I]
But I'll try to remember them all, let's see...
Acquired by my father (almost all are more than 20 years old):
- Märklin 3044: EA800, analog (used only for testing electric connections and catenary).
- Märklin 3038: SNCF BB9200, digital (converted with 60903).
- Märklin 3050: SBB Ae6/6, digital (converted with 60904).
- Märklin 3055: NS 1200, digital (converted with 60904).
- Märklin 3057: DB 151, digital (converted with 60901).
- Märklin 3155: DB 111, digital (converted with 60901).
- Electrotren 2001: RENFE 333, digital (converted with Uhlenbrock 75200).
- Roco 4134B: DB 420, digital (converted with Roco 10738).
- Roco 69026: DB VT98, digital.
Acquired by me:
- Märklin 3033: DB 110, digital (converted with 60901).
- Märklin 37554: DB 055, digital.
- Märklin 37844: DB 50, digital.
- Märklin 29461: Wiebe 212, digital.
Belonging to my girlfriend:
- Märklin 29550: 5962 "Hogwarts Castle", digital.
- Märklin 37535: DB 120 "Mickey Mouse", digital.
So this makes a total of 15 HO locomotives focused mainly on era IV. The only possible additions in sight would be a 39560 (SBB Ce6/8, it's a must-have in any alpine layout... and ours sure will be!), a 39010 (BR 01 with coal tender and sound, at last!), a 37901 (BR 290 for heavy switching and short freight trains), and a possible future 3722x (ÖBB 1020 in orange livery). Perhaps there'll be more to come. Just wait and see what Märklin is going to offer us in some years' time

Kind regards.