HOn30 brass locomotive kit re-released by Toma at the end of 2015 (first release in 1982).

http://www.happy-farm.gr.jp/railway-model-gallery/HO_sango_SRRL_2-6-2.html

Sandy River and Rangeley Lakes Railroad
S. R. & R. L. #18

Wikipedia: Built by Baldwin Locomotive Works in 1893 for Sandy River Railroad (No. 2) as a 2-6-0. Rebuilt in 1916 as 2-6-2. New tender built by Baldwin Locomotive Works in 1926. Scrapped 1936.

Maine Two Foot Gauge 2-6-2 Prairie Locomotives by Peter S. Barney

Chassis / Frame

The new kit includes a coreless DC motor from Namiki, Japan, I suppose type CMS10-1346! The 1:24 reduction gear seems to be the same as the one used in the SangoDachshund kit. The motor is excellent but way too fast, about 28'000 rpm = 467 /s. With reduction gear of 1:24 (19.4 /s) the speed at 12 V is (driving wheel diameter 9 mm) v = 9 mm * Pi * 19.4 /s = 550 mm/s = 0.55 m/s, vproto= 0.55 m/s * 87 = 47.8 m/s = 172 km/h.

Working Headlight (LED potted in clear 5 Min epoxy, 30 AWG magnet wire)

BOM

• U-Joint 1.5 mm shaft NWSL #487-6
• LED warm white for headlight e.g. PLCC2
• LED red for ashpan e.g. PLCC2 VLMS30J1K2-GS08
• LED yellow for ashpan e.g. PLCC2 VLMY3000-GS08
• 2 PCS SMD Resistor 1 kOhm 1206
• PC-Board ROTH Elektronik RE 437
• Magnet Wire e.g. 30 AWG from Spark Fun
• Mounting Tape Tesa 55740
• Clear 5 Min Epoxy for potting the headlight LED
• Ribbon Cable Wiremount Socket Assembly, 1.27 mm, 3x2, Mouser #517-45106-000030
• Ribbon cable

Wiring

Color	NMRA JST Pin#	Loco Header Pin#	Function
Red	8	1	Right Rail Pickup
Orange	7	2	Motor(+)
Gray	3	3	Motor (-)
White	5	4	Headlight
Green	9	5	FX3 (Ashpan Flicker CV 51: 23+128=151, F24)
Blue	6	6	Function Common (+12V)

3M™ Ribbon Cable Wiremount Socket Assembly, 1.27 mm (0.050") Pitch, 451 Series, Digi-Key 45106-000030, Mouser 517-45106-000030

Tender, Sound

BOM

• TSU-1100 Steam-2 (1 Amp) Tsunami2 Decoder - Steam, SoundTraxx #884006
• 20 mm Speaker, SoundTraxx #810053
• 20 mm Speaker Gasket Kit, SoundTraxx #810118
• Bipolar Capacitor 220 uF 25V, SoundTraxx #810128 (included in TSU-1100)
• Ribbon Cable Wiremount Socket Assembly, 1.27 mm, 3x2, Mouser #517-45106-000030
• Ribbon Cable

Wiring

Color	NMRA JST Pin#	Function
Black	2	Left Rail Pickup
Yellow	4	[Backup Light]
Blue	6	[Function Common (+12V)]
Purple	-	Speaker (+)
Purple	-	Speaker (-)
Blue	6	Current Keeper [Function Common (+12V)]
Green/Yellow	-	Current Keeper [Ground]
Green	9	FX3 not connected
Brown	1	FX4 not connected

Superstructure

DCC Decoder

Loco #18, ashpan F24

Sound Configuration

Draft

Function	CV	Value	Type
Sound Configuration 1	112	4
Fuel Type		+1+2, 0	Hand-shoveled Coal
Injector		+4, 4	lifting
Power reverser		+8, 0	disabled
3-cylinder exhaust		+16, 0	disabled
Articulated wheel-slip		+32+64, 0	disabled
Articulated exhaust		+128, 0	disabled
Engine Exhaust Control	114	90?	faster, for 4 chuffs per revolution
Whistle	120	2	Baldwin Single-Chime
Bell	122	5	Light Brass (1)
Exhaust Chuffs	123	0	Light (1)
Airpump	124	0	Single-Phase (1)
Dynamo	125	0	Dynamo (1)
Coupler Select	126
Poppet Valve Release Rate	200

Motor Configuration

Draft

Function	CV	Value	Type
Baseline Acceleration Rate	3	0	no momentum
Baseline Deceleration Rate	4	0	no momentum
BEMF Cutoff	10
PID Kp Parameter	209
PID Ki Parameter	210
Low-Speed Compensation	211
BEMF Feedback Intensity	212
Low-Speed Compensation	211
BEMF Sample Period	213		default 15
BEMF Sample Aperture Time	214		default 15
BEMF Reference Voltage	215		6 to 25.5 V (60 .. 255)

https://sites.google.com/site/markgurries/home/decoders/decoder-motor-tuning/soundtraxx

Notes from the Internet:

1. CV213/14: Adjusting CV213 can achieve very good low speed at the expense of full speed. You have to strike a balance but try values between 5 & 10. The default setting of 15 in both CV213/14 appears to be too high for a lot of motors. But keep CV213/14 set to the same value what ever you end up with. Setting CV214 to a value 3x CV213 will stop the motor in its tracks unless you bring the speed step way up.
2. There is a report that using the User Defined Speed Table CV 25 defeats the BEMF tweaks you make. The idea here was to make up for the effects CV213 had on the speed range. [3]
3. Recent test that achieve good results with CV213/14 set to 5 first. Then set CV209 (Proportional) to max 255. Then reduce CV212 (Intensity) to get it to run smooth which was about 80. Playing with CV210 (Static) did not seem to change much at slow speeds.

Mark G Notes:

1. It seems that CV213 is the first one to set for low speed performance before doing anything else. Given the BEMF is weakest at low speeds, you need to increase the sample rate (decrease sample period or make CV213 smaller) to increase the BEMF data to obtain any chance of good BEMF performance. The question is what to set the other CV’s to allow you to determine the best setting of CV213. This concept appears to be correct based on one credible internet report. Procedure: Leave all other BEMF CV’s at their factory default and only adjusting CV213 and 214 down between 5 and 10 but with identical values between the two will improve performance. A value of 8 is a good place to start.
2. Given CV213 effect on top speed, it seems that CV213 should be dynamic and may in fact be the trick used by other BEMF decoders to get extended slow speed performance. Sample period goes up as the speed step goes down. Sample period goes down and the speed step goes up. This would get you the best of both worlds.
3. Adjustment should be done with momentum and start voltage all set to zero. [1]

ToDo

• Front light, small LED
• Chassis 1 mm Loch ausbohren, 1 mm Schraube
• Piston verlängern
• Tender-Loco Coupler