TTm 1/120 - Spreewaldbahn narrow gauge passenger cars 901-212, 901-213 and 901-211

You should not print the do_not_print versions!

Important for resin prints: You'll find my improved variant of wagon 901-211 here for TTm and H0m

You'll find some related but not identical German blog posts on tt-board.de:

• DE 3D-Druck der Wagen 901-212, 901-213 und 211 der Spreewaldbahn
• DE Wagen 901-212 der Spreewaldbahn - Feinarbeiten und Ergebnis
• DE Wagen 901-211 der Spreewaldbahn - Feinarbeiten und Ergebnis

If you print the following designs, please post your make, comment or just tell me. I don't need many of the cars and a lot improvements of the 3D files and documentation are only made to give you better results.

Unexpected for myself, I added the side (mirror for 2nd side wall) for 901-211 too ... so if you want to build the not reconstructed versions -- have fun. The text will mainly refer to the 212 and 213, I aimed on ...

I added some additional parts (like the M2 ones) to provide you more opportunities.

At the moment (2023-02-05):

• 901-212 is done with alternative floor and couplings (first version with M3 screws).
• 901-213 printed, mainly built, primed, first final layer of paint, windows added
• 901-211 is done with alternative M2 floor and couplings, changed to M2.5 screws, nearly done - handrails and some paint is missing. This coach was not my main target. But I decided not to skip the opportunity and provide more designs to build.

I added 2 parts of the 901-211 for a test print in resin, but I didn't tested this and it has holes for the M2 screw in the chassis to find the right point but no hole for the nut in the furnishing/floor.

If you use Instagram or TikTok, you may see some footage here:

• making Windows for 212 and 213 on TikTok
• final view on TikTok, German spoken
• making Windows for 212 and 213 on Instagram
• final view on Instagram

##H0m##
I was asked to adapt the 901-211 to H0m gauge. Now I added the improved variant of wagon 901-211 in H0m and TTm here

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###History

Four nearly identical coaches were built in 1928 in Gotha for the Spreewaldbahn, a 1000mm narrow gauge railway between Cottbus and Lübben (Germany). After being added to the Deutsche Reichsbahn (DR) they got the numbers from 901-211 to 901-214. These wagons were wider than usual narrow gauge coaches - 2.90m (maybe 2.94m), so they are not as cute as they could be.

Two of them (212 and 213) were reconstructed in the 1950s(?) with less and larger windows, I see this as an advantage, if you add single windows from clear material.

Here we have one base design with both reconstructed wagons:

• 901-212 with toilet (smaller, white window in the middle) and
• 901-213 without toilet

Have a look at source [2], if you want to visit the two unreconstructed and the surviving reconstructed coach 901-213. If you know the history of wagon 901-212 after 1970 -- please tell them.

According to a personal mail conversation the size of the reconstructed and original wagons don't differ.

I didn't find any blueprint of the 901-212 or 213, so I had to use pictures. For interior I used a blueprint in H0 scale in [7] of the car 211. I think, both of my created interiors are plausible but not confirmed.

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###Printing

Parts with 212 or 213 in file name are only for the specified model. The 21x parts are for both. To make it less complex, look for T-head N gauge couplings and coupling plates on my older designs.

####You need for 901-212:####

Walls -side and front

• TTm_Spreewald_901_21x_prn-side_wall.stl
• TTm_Spreewald_901_212_prn-side_wall.stl (side with toilet window)
• TTm_Spreewald_901_212_furniture.stl

Front side is depending on roof version

• TTm_Spreewald_901_21x_front_A_001.stl
• TTm_Spreewald_901_21x_front_A_002.stl

Depending on the roof you choose the front sides with or without a hook - maybe prefere the C-version. The original roof is thin.

Roof (you could make it from a sheet of metal)

• TTm_Spreewald_901_21x_roof_A_print_on_top.stl (version A)

  could work, but if supports stick ... no fun

• TTm_Spreewald_901_21x_roof_B_full_material.stl (version B)

  version I used for my very first try, it works but requires much manual carving

• TTm_Spreewald_901-21x_roof_C_with_small_supports_and_ventilation.stl

  was a nice idea to add a lot of 0.4mm supports but.... just trying

• TTm_Spreewald_901_21x_roof_D_massiv_center_comlete.stl
• TTm_Spreewald_901_21x_roof_D_massiv_center_comlete_lt.stl

  not my design favourite, but could be the easiest version to print with 2 types of additional support material at the ends. After some tries i printed the lt version for 212 with al little more flow at the beginning.

• TTm_Spreewald_901_21x_parts_for_roof.stl (only for roof version A or a sheet metal version)

I print the roof with 0.5mm layer.
It was just an idea: if you use a PLA printer, like me, print roof B without air ventilation and chimney and upside down and add supports. But: my supports were to sticky and the print of the lower (later upper) section was too thin.

The idea of roof D is a massive core (with some space for LED lights) and supports at the end above the platforms to cut away.

Keep in mind, there is a reason, I added more than one roof ... I'm still not happy with these.

Frame

• TTm_Spreewald_901_21x_Wheelbearing_S1.stl
• TTm_Spreewald_901_21x_Wheelbearing_S2.stl (advice: use S1 mirrored, S2 has a little problem at the stairs)
• TTm_Spreewald_901_21x_Frame.stl

I run out of springs for T-head couplings and especially for small curve diameter you may have a look at the alt version. I added 901-21x_alt_floor-coupling.stl as couplings for this experiment with M3 screws. First test has shown the train will run pulled with 20cm diameter track circles. Maybe a future version for smaller screws will come.

Second alternative was planed to use M2 screws ... but I used it with M2.5 screws in wagon 901-211.

Handrails (I used a version soldered from brass pieces and wire)

• TTm_Spreewald_901_21x_handrails.stl
• 21x_V03-could_be_added_as_floor_correction.stl could be useful, if the handrails are a little to big and you need a little additional floor length...

I hope the list was not too confusing. If you want to create the 213 switch the 212 to 213 parts.

It isn't an easy print. I advice to use rafts for the frame parts and a layer height of 0.12 to 0.16 for the bearings, they don't loose much, but I had less problems.

The 901-21x_V03-glueing_stand.stl could be helpful as support for glueing the sides to the fronts ... not necessary but maybe this helps a little, depending on your print, you should sand it a little to fit it into the prints of all sides.

Just thinking: setting number of wall lines high may prevent the pattern on the sides/fronts and needs less sanding.

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###Building

For 901-211, 901-213 and 901-214 cut the waste pipe at the bottom, there is no toilet.

Hints for upper part:

• Keep an eye on the pictures, the front sides are not identical. The side parts are mirrored and differ in the position of the vertical bar.
• Use the chimney and the bar between window 3 and 4 as orientation
  • 3 windows, bar on sides & chimney, 2 windows
  • small wall beneath the door = one seat = oven & chimney

Hints for lower part:

• The interiors can be glued on the frame / floor plate. Only 901-212 has a toilet, so every other wagon get the 213 interiors. If want to make resin windows, you should print with more wall lines and cut/sand some parts from the furniture.

Make the grab handles from wire - the holes in platform floor and roof are for orientation.

If I wouldn't published this there and there were no need for hints, I would:

• make the roof from a sheet of metal.
• make the hand rails from brass

Windows

I used CD cases for my 901-212 and 901-213.

For the 901-211/214 I added 3 stl files to print a prototype for a mold to cast them from clear resin.
901-211_windows-6mm_mold_frame.stl (just an idea, you can use other and wider frames)
901-211_windows-minus03.stl
901-211_windows-minus05.stl
Version minus03 has 0.3 mm smaller windows (width and height) than the designed holes, version 05 0.5mm, after I realized the 03 will have problems to fit.

I glued the mold frame and the prototype with double sided tape on a base for creating a silicon mold. You should sand, fill and polish the outsides of the prototype window to get clear windows. I didn't this as perfect, as I would recommend, so I had to sand and polish the resin windows - works quite well with nail polishing products.

Resin cast of the windows worked well but not perfect. I had to part the stripe and insert every double window separately, it seems the used silicon or resin changes its size a little. With these resin windows you have to remove some material from the furniture to create space (I will not add a special interiors version).

You will find some videos / pictures on TikTok and on Instagram

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###Updates
20230318: removed resin filed here and put a improved version at a new location.
20230227: added files to print the 901-211 in resin BUT keep in mind, I didn't tested these!
20230205: added pictures of the finished 901-211 and a progress picture of platform handrails
20230126: added pictures of resin windows and removed the on progress marker. Made and added an alternative floor, interior and couplings for M2 screws (but I used M2.5 screws ... don't as why, I cut/drilled the M2 version to the 2.5mm).
20230106: added a window prototype for 901-211 to create a mold for clear resin
20221204: finished wagon 901-212 and added a small strip as possible correction for differing floor length when adding hand rails.
20221116: 901-21x_alt_floor-coupling.stl added couplings to alternative frame
20221115: added an alternative frame because the minimum curve diameter are limited to about to 40cm, maybe 30cm with the standard couplings. I hope to be able to use 20-25cm diameter. Need to add and test alternative couplings.
BTW: I renamed some parts, because I found some errors. Suddenly its only possible with a reupload.
20221113: added two supports to find points to drill holes for hand rails (I used a 0.7mm drill for 0.6 mm wire) you should turn them before printing
20221112: duno why, I added the sides walls for 211 too
20221110: Added 901-21x_V03-glueing_stand.stl as support for glueing the sides
20221108: played with roof D, hoped it will print better. Differences between TTm_Spreewald_901_21x_roof_D_massiv_center_comlete.stl and
TTm_Spreewald_901_21x_roof_D_massiv_center_comlete_lt.stl is additional wasted material for better plate contact at the first ....

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###Origin and licensing

For technical drawings of wagon 211 look at the sources below, I searched for a source for 213/212 but didn't found one. The size of the wagons is the same. Position and size of the windows were calculated from several pictures.

You are free to print and rescale my work for your projects, close friends and your model railway club.

I don't want any commercial use of this design and prints.

If you are representing a model or railway club, a school or something comparable with these and want to use it for educational purposes in higher numbers, please tell me.

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###Sources and more literature

BTW: The journal "der modelleisenbahner" is available online at several places, like archive.org. I will not add links for several reasons.

[1] Großstück, Harald (1988). Die Spreewaldbahn. Neueste Erkenntnisse aus ihrer Geschichte. der modelleisenbahner 37 (5), 5–7.
[2] IG Spreewaldbahn e.V (2022). Personenwagen 901-213. Available online at https://www.ig-spreewaldbahn.de/fahrzeuge/personenwagen/pw-901-213/ (accessed 11/5/2022).
[3] Kieper, Klaus/Preuß, Reiner/Rehbein, Elfriede (1980). Schmalspurbahn-Archiv. Berlin, Transpress, Verlag für Verkehrswesen.
[4] Preuß, Erich (1979). Die Spreewaldbahn. Berlin, Transpress, Verlag für Verkehrswesen.
[5] Spranger, Friedrich (1965). Die Spreewaldbahn. der modelleisenbahner 14 (7), 203–205.
[6] Uhlemann, Karlheinz (1972). Der Fahrzeugpark der ehemaligen Spreewaldbahn. der modelleisenbahner 21 (11), 328–331.
[7] Uhlemann, Karlheinz (1972). Der Fahrzeugpark der ehemaligen Spreewaldbahn. der modelleisenbahner 21 (12), 365–369.