My B'B' and Bo'Bo' (four axles) Märklin diesel locomotives:

Updated 2011-10-26

Märklin 3021, DB V 200 027:

Märklin 3074, DB 216 090-1:

Märklin 3772 A, DB 212 225-7:

Märklin 3772 B, DB 212 225-7:

Märklin 3774, DB 216 127-1:

Märklin 37500, ONTC RAm 1984:

The conversions made to these models:
Märklin
locomotive
number
Motor Decoder Functions Additional parts
Originally
fitted
Converted
to
Originally
fitted
Converted
to/with
3021 lfcm 3* no change Analogue no change tripple A front light on when driving  
3074 dcm 3* dcm 5*
6090
Analogue 6090 f0 = front light, changing with direction  
3772 A lfcm 3* dcm 5*
60904
6080
prototype
60932
mfx
f0 = front light, changing with direction
f1 = interior light RH side
f2 = interior light LH side
f3 = driving sounds
f3 = shunting speed
f4-f15 = other sounds and functions
456200 holder for decoder
2x 28V T1 bulbs for interior light
2x 2-pole SIL as bulb sockets
B lfcm 3* no change 6080
prototype
no change f0 = front light, changing with direction  
3774 lfcm 3* no change 6080
prototype
no change f0 = front light, changing with direction  
37500 dcm 5* no change c91
sound
no change f0 = front light change with direction
f1 = interior light in the cars
f2 = bell
f3 = horn
f4 = acc/brake delay cancel
 

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