Remotoring United PRR L1s 2-8-2 Mikado
Original PFM Model
United Scale Models / Pacific Fast Mail PFM, '1969-run

Brass Guide

http://trainmaster.ch/ZX-677.htm

UL-077-02.jpg
From the seller's site

Prototype

L1-builder.png
L1

Wikipedia L1s: Class L1s on the Pennsylvania Railroad comprised 574 2-8-2 "Mikado" type steam locomotives constructed between 1914 and 1919 by the railroad's own Juniata Shops (344 examples) as well as the Baldwin Locomotive Works (205) and the Lima Locomotive Works (25). It was the largest class of 2-8-2 locomotives anywhere, although other railroads had more Mikados in total.

PRR 520 19930000 PA Strasburg.jpg
Preserved #520 at the Railroad Museum of Pennsylvania.

Coreless DC Motor

Coreless DC Motor

I replaced the open frame motor with a coreless DC motor Maxon A-max 22 12V/6W.

L1s-maxon.jpg
Coreless DC motor (Maxon A-max22 12V/6W). Motor starts at about 0.8 V and draws 100 mA on the test stand.

Shafts and U-Joints from NWSL

  • 492-6 U-Joint, 2 mm shaft

You can get it from Old Pullman or direct from NorthWest Short Line.

Roller Test Stand Videos

Roller Test Stand Videos

Decoder Installation

Decoder Installation

BOM

  • TSU-2200 Steam-2 (2 Amp) Tsunami2 Decoder - Steam, SoundTraxx #884007
  • CurrentKeeper SoundTraxx #810140
  • 28mm x 40mm Oval Speaker Gasket Kit, SoundTraxx #810139
  • Medium Oval Speaker, SoundTraxx #810078
  • Pin Header 2.54 mm (1/10") 3x2
  • Pin Socket 2.54 mm (1/10") 3x2
  • 2 PCS LED white for headlight and backup light e.g. PLCC2
  • LED red for ashpan e.g. PLCC2 VLMS30J1K2-GS08
  • LED yellow for ashpan e.g. PLCC2 VLMY3000-GS08
  • 3 PCS SMD Resistor 1 kOhm 1206
  • PC-Board ROTH Elektronik RE 437
  • Magnet Wire e.g. 30 AWG from Spark Fun
  • Mounting Tape Tesa 55750 (55740)
  • Clear 5 Min Epoxy for potting the headlight LED
  • Locomotive drawbar 15 x 8 x 0.5 mm, tender drawbar 10 x 8 x 0.5 mm (brass sheet)

Docs

Soundtraxx Tsunami2 TSU-2200

Wiring

Locomotive

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

Tender

Color NMRA JST Pin# Function
Black 2 Left Rail Pickup
Yellow 4 Backup Light
Blue 6 Function Common (+12V)
Purple - Speaker (+)
Purple - Speaker (-)
Blue - Current Keeper [Function Common (+12V)?]
Black - Current Keeper [Ground?]

Spare

Color NMRA JST Pin# Function
Brown 1 FX4
Green/White - FX5
Brown/White - FX6

Sound Configuration

Function CV Value Type
Sound Configuration 1 112 11  
Fuel Type   +1+2, 3 Coal Stoker
Injector   +4, 0 Non-lifting
Power reverser   +8, 8 enabled
3-cylinder exhaust   +16, 0 disabled
Articulated wheel-slip   +32+64, 0 disabled
Articulated exhaust   +128, 0 disabled
Engine Exhaust Control 114 58 faster, for 4 chuffs per revolution
Whistle 120 42 PRR Round Top 3-Chime
Bell 122 27 Heavy Brass (3)
Exhaust Chuffs 123 6 Heavy (1)
Airpump 124 8 Dual Cross-Compound
Dynamo 125 2 (default, dynamo 3)
Coupler Select 126 128+1=129 Heavy Coupler F13

Light Configuration

Function CV Value Type
Forward Direction Enable 57 1+4=5 Headlight Forward & FX3 Enable
Reverse Direction Enable 58 2+4=6 Backup Light Reverse & FX3 Enable
Hyperlight Effect Select 49 15+128=143 Headlight Dyno-light & LED
Hyperlight Effect Select 50 15+128=143 Backup Light Dyno-light & LED
Ashpan Flicker 51 23+128=151 FX3,LED F24

Motor Configuration

Function CV Value Type
Low-Speed Compensation 211 150 ?  

Headlight

  • Cal Scale HO PRR Headlight #190-477
  • Cal Scale HO Headlight PRR Modern #190-235
  • Cal Scale HO PRR Headlight Bracket #190-478

Cab Details

  • Throttle
    • PSC Oversize #3058
  • Reverse Lever
    • PSC #3260
  • Gauges
    • PCS Dual #3226
    • PCS 4 gauges #3071
  • Brake Control
    • PSC Westinghouse H-6 #3044
  • Stoker
    • PSC Duplex type #3059
  • Seats
    • PSC #3046
  • Valve Control
    • PSC #4884

Finished Model

Finished Model

-- Peter Schmid - 2019-07-08

Creative Commons License
This work by Peter Schmid is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

  • I1-header.jpg:
    I1-header.jpg

Title

https://en.wikipedia.org/wiki/Pennsylvania_Railroad_class_L1s

http://trainmaster.ch/ZX-677.htm

-- Peter Schmid - 2021-01-08

Comments

  • PRR_520_19930000_PA_Strasburg.jpg:
    PRR_520_19930000_PA_Strasburg.jpg
Topic attachments
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PNGpng L1-builder.png r1 manage 1396.6 K 2021-01-24 - 17:41 PeterSchmid  
JPEGjpg L1s-header.jpg r1 manage 75.3 K 2022-12-21 - 13:52 PeterSchmid  
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JPEGjpg PRR_520_19930000_PA_Strasburg.jpg r1 manage 193.9 K 2022-12-21 - 13:25 PeterSchmid  
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