Wanted
All numbers are per Koll 2008. Conditions need to be very good or better. Box is not an absolute must.
When variation requested is listed as "any", less expensive versions are preferred.
Locomotives
Brand Scale Number Variation Description
Märklin H0 3051 3 NS electric, blue, number 1211, double arrow on each side
Märklin H0 3055 1 NS electric, gray/yellow, number 1212, divided air vents, top nose yellow
Passenger Cars
Brand Scale Number Variation Description
Märklin H0 352 E LMS 1 dining car, red, stamped LMS, for British market
Märklin H0 353 E LMS 1 sleeping car, red, stamped LMS, for British market
Märklin H0 40542 1 DSG sleeping car, red/gray
Märklin H0 42862 1 Intercity passenger car, white with red stripe, 1st class
Freight Cars
Brand Scale Number Variation Description
Märklin H0 307/2 1 or 2 DB box car, yellow, Jamaica (later 4509)
Märklin H0 308/2 1 DB container car, silver, Braunkohlenstaub (later 4511)
Märklin H0 311S any gondola, brown, with white stone
Märklin H0 313/2H 1 stake car, brown, with tree wood load (later 4608)
Märklin H0 313/3 1 gondola, brown/white, with Märklin tarp (later 4609)
Märklin H0 314S any tank car, yellow, Shell
Märklin H0 315/4 1 auto transport car, brown, no cars (later 4612)
Märklin H0 316 any box car, brown, with brakemanscab
Märklin H0 321 any stake car, brown, no load
Märklin H0 363 any gondola, brown/white, with Märklin tarp
Märklin H0 365 any gondola, brown, high sided
Märklin H0 372G any stake car, brown, with tree wood load
Märklin H0 381S any box car, brown, with tail lights on roof
Märklin H0 391/1 1 or 2 DB gondola, brown, long (later 4514)
Märklin H0 392C 1 or 2 DB stake car, black, no brakemanscab (later 4516)
Märklin H0 393 any gondola, brown/white, with Märklin tarp
Märklin H0 393C 1 or 2 DB gondola, brown/white, with Märklin tarp, long (later 4517)
Märklin H0 4442 5 NS tank car, yellow, Shell (2 axle)
Märklin H0 4678 85701 Märklin Museum car 1985, ocra
Märklin H0 48682 1 4MFOR car with a Leopard 2, only available at Eurotrain
Set
Märklin H0 28503 1 Rheingold set, beige/blue (also looking for extra car 40891)
Märklin H0 29103 2004701 NS starter set with class 1100 in dark grey
Märklin H0 37781 2 NS, ICE, white, "Watergraafsmeer"
Paper
Brand Scale Number Variation Description
Märklin Issue 2 2006 Märklin Magazin and News (Dutch)
I also collect Dutch (NS) Special Imprint Items. 
Some that I don't have are listed below.
There are also quite a few that have never been cataloged.
Please contact me if you have Dutch Special Imprint Items for sale.
To see which cars are already in my collection please click on the "pdf" link below. 
imprint.pdf
Special Imprint Cars
Brand Scale Number Variation Description
Märklin H0 4415 83522 box car, Spielhuus, green
Märklin H0 4415 92748 box car, Märklin club '92, multi
Märklin H0 4415 2004714 box car, Roosendaal Spoort, 150 Jaar
Märklin H0 4481 88502 box car, Intertoys, yellow
Märklin H0 4481 94723 box car, Strukton, white/purple