I like this articulated old electric locomotive a lot. Märklin 37292 was originally equipped with a c90 digital decoder.
The prototype was made in Germany, in 1925-1927.
34 of these nice locomotives were made, by Krauss and Wasseg. As far as I know, 16 of these were allocated to the Bavarian railways, as EG5.
From 1927 DRG called them E91. They were in traffic until 1975. For further details, see table at the bottom of this page.
Preparation for conversion:
I removed the decoder and all the electrical parts. I also split the three parts and removed the bottom plastic part under the bogies.
The new locomotive inside:
The motor is not changed. After removing the brushes, make sure that all mechanical functions, like the transmission, wheel axles and the rods, are good and that the locomotive is clean. Make sure that the motor looks like the one in the photo, without any additional parts soldered to it. Before inserting the brushes, make sure once more that everything rotates perfect. If required, oil the rotating parts very carefully. Do not use too much oil, as this may harm the operation of the locomotive.
The original 6090 decoder was screwed to the holder which is used for the speaker now. I installed the new decoder in the middle section, fixed to a small home made plastic bracket (cut from an old 6090 decoder cover) and secured with some green sticky stuff from Faber Castell. I do like things to be removable, thus now super glue, except for the plastic bracket itself to the locomotive chassis.
Decoder adjustment, with my Märklin CS1:
The EG5 (or E91) had a maximum speed of 55 km/h. The max. speed is set to 53/255.
Minimum speed is set to 1/255.
Acceleration and braking delay:
Both are currently set to 15,000 seconds.
See table further down the page.
Initially I installed the decoder from the 60933 set where the c90 decoder used to be.
To get a fuller sound I installed a 23 mm 100 Ohm speaker from ESU. I made
a small bracket screw to the hole for the decoder. The speaker is screwed
to the bracket and glued with some green stuff in the front end.
The bulb is for internal light, ot working very well.
The front end inside with the new speaker:
The different ends:
Most of the electric bogie locomotives from Märklin have the pick-up shoe under
end 1 (front) and the motor in end 2 (rear). 37292 had the pick-up shoe
under the motor, which was installed in end 1 (front).
After my rebuild the motor is in the rear end and the pick-up shoe under the front end. I swapped the plastic parts under the bogies to fit the pick-up shoe. I do not remember if the threaded hole for the pick-up shoe screw was there, or if I had to drill it and cut the 2mm threads by myself.
I am not happy with the interior light, controlled by functions f1 and f2, so I will make some changes later some time.
Parts used for the conversion:
|60933||1||mfx sound decoder set|
|ESU 50442||2||100 Ohm 23mm speaker with sound chamber|
|-||4||2-pole bulb connectors, cut from a 20-pole SIL connector|
|-||4||28V T1 bulbs for interior light|
My setting of the decoder:
|Decoder settings, 37292||Default||Mine|
|Enable analog mode||check||<|
|Control parameter K||60||<|
|Control parameter I||120||<|
|Driving Sound Rate:|
|At min. speed||1,000||0,480|
|At max. speed||1,240||1,000|
|Diesel or electric locomotive|
|Spacing for shift levels||?||24|
The 37292 function table:
|37292 DRG EG5 22521|
A screenshot from my Märklin Central Station 1:
Prototype information, from Wikipedia:
|Bavarian state railways class EG 5|
BDRG Class E 91
DB Class 191
|Number(s):*||Bavarian EG5 22501 - 22516 |
DRG E 91 01–20, 81–94
DB 191 001–020, 081, 088–094
|Year(s) of manufacture:||1925–1927|
|Length over buffers:||16,700 mm|
|Service weight:||123.7 tons|
|Axle load:||20.7 tons|
|Top speed:||55 km/h|
|Power output (one hour):||2,200 kW (2,822 ps)|
|Power output (continuous):||1,660 kW (2,258 ps)|
|Starting tractive effort:||294 kN|
|Power index:||17.8 kW/t|
|Driving wheel diameter:||1,250 mm|
|Electric system:||15 kV 16 2/3 Hz AC|
|Traction motors:||2 double traction motors|
|Transmission:||Winterthur diagonal side rod drive|