Here is my most recent project - adding sound to a Stewart/Bowser DS-4-4-1000. Although it isn't a Bachmann product, I hope it gives some idea as to where to fit the decoder and speaker in some of the smaller diesel models.
Since I have no idea what a Baldwin engine sounded like I fitted one of the new Soundtraxx DSD101LC decoders with 1st gen EMD motor sounds and a 1" oval speaker(8 ohm).
Here is an unmodified chassis block and circuit board with 8-pin plug.
(http://www.trainboard.com/railimages/data/935/IMG_1397.JPG)
(http://www.trainboard.com/railimages/data/935/IMG_1398.JPG)
I cut away much of the front chassis weight to lower it to the same height as the rear weight - ie just above the worm gear housing.
I also stripped out the circuit board and cut the plastic holding lugs from the motor housing.
After adding some lead above the motor as a heat sink, I wired up the sound decoder, using the salvaged resistors from the circuit board for the LEDs.
(http://www.trainboard.com/railimages/data/935/IMG_1400.JPG)
The speaker is fully enclosed in a baffle made of plastic sheet and all holes are sealed with Squadron putty. the LED for the front light has been taped to the top of the baffle.
(http://www.trainboard.com/railimages/data/935/IMG_1401.JPG)
(http://www.trainboard.com/railimages/data/935/IMG_1403.JPG)
I have managed to fit everything under the loco's hood so as not to mess up the detailled cab interior at all, something I was keen to avoid.
Jon
Hi Jon;
Nice work.
A Baldwin does not sound anything like an EMD. Baldwin switchers had in line 6 or 8 cylinder 4 stroke diesel engine, some of the 6 cylinder ones had turbochargers. The engines were very low rpm marine based units. EMD switchers typically had V12 two stroke diesel engines, with a max rpm around 1000-1100.
LokSound has Baldwin sound units, I do not know about SoundTraxx.
Given that Bowser now offers sound chassis for thier Stewart F units, with LokSound, I expect that the other locomotives in thier line are not far behind, if the F unit sound chassis are successful.
Nigel:
Soundtraxx has been promising for some time to do a Baldwin decoder, but with the LokSound available, who knows.
Jon:
Excellent work. If you made the DSD-101LC fit into this sucker, you can make the LokSound fit. Only downside of course, is the price. Besides, as they say, there's a prototype for everything. Repowering a Baldwin with an EMD 567 would not be out of the question, so what the heck.
John Loesch
I repainted the DS-4-4-1000 into Erie colours before taking some video.
(http://www.trainboard.com/railimages/data/937/IMG_1423.JPG)
(http://www.trainboard.com/railimages/data/937/IMG_1422.JPG)
(http://www.trainboard.com/railimages/data/937/IMG_1420.JPG)
It still needs some dullcoat and a bit more weathering to hide the marks round the decals, but that's a minor job.
Jon
Finally got some video footage up.
Black and white
http://www.railimages.com/gallery/album508/aax
Colour
http://www.railimages.com/gallery/album508/aay
You Tube link
http://www.youtube.com/watch?v=rTp1lsAdmZk (http://www.youtube.com/watch?v=rTp1lsAdmZk)
Jon