Skip to the content

We are very excited to be getting back in the Du-Bro business!  Our first order has been placed and we should have stock by mid July.

Home / Products / N P3 PRR M1b 4-8-2 Steam Loco #6761/DC/DCC Sound

N P3 PRR M1b 4-8-2 Steam Loco #6761/DC/DCC Sound

SKU: BLI3640 Category:
UPC Code: 836563036404
Scale: 1/160Discontinued
MSRP: $369.99Minimum Quantity: 1

In 1930, the celebrated success of the M1
Mountain-type locomotives prompted the Pennsylvania Railroad to order
100 more locomotives of the 4-8-2 wheel arrangement.  The new
locomotives became the M1a class and had a longer wheelbase than the
M1’s due to the addition of the Worthington feedwater heater. They also
received new larger tenders, class 210F75, which became known as the
coast-to-coast tenders.

The first 50 M1a locomotives, #6700 – 6749,
were built by Baldwin.  The Juniata Shops, which became knows
as the “Altoona Works,” built the next 25 M1a’s numbered 6750 – 6774,
and the remaining 25 M1a’s were built by Lima and were numbered 6775 –

Starting in 1946, 41 of the M1as received
further improvements by increasing the boiler pressure and adding
circulators to the firebox. The improved M1as became the M1b
class.  The best way to tell them apart is to look for the
circulators on the firebox just above the running boards.  The
circulators are those round objects in a diagonal line that look like
wash-out plugs.

The PRR M1a/bs were considered to be the
finest of the PRR’s steam locomotives.  They were designed as
dual service locomotives, hauling passenger trains and also saw duty in
general freight service. And in the end, they even hauled the heavy ore
trains, which there were not originally intended to pull. 
They did it all in style!




  • Paragon3
    Sound & Control System with Rolling Thunder
  • Integral DCC
    Decoder with Back EMF for Industry Best Slow Speed Operation
    in DC and DCC

  • Motor Type: 5-Pole Can with Skewed Armature & Fly Wheels

  • Authentic PRR M1a Sounds
  • Premium
    Caliber Painting with Authentic Paint Schemes
  • Prototypical
    Light Operation with Golden White LED Headlight and Reverse Light Jewel
  • Beautifully
    Detailed, Accurately Modeled Locomotive
  • Separately
    Applied Details such as brass bell, grab irons, and ladders
  • Constant
    Intensity Directional Lighting

  • Locomotive Composition: ABS plastic with Die Cast Chassis
  • Tender
    Composition: ABS plastic with Die Cast Chassis

  • Locomotive Length: 6.5 inches
  • Tender
    Length: 3.8 inches

  • Couplers: Microtrains #1015 compatible

  • Recommended Minimum Radius: 9.75 inches



Industry-Leading SOUND

  • Operates
    in DC & DCC
    (use DCMaster for DC Sound)
  • Unmatched
    frequency response
    as low as 20 Hz when paired with Rolling
    ThunderTM subwoofer kit
  • 16-bit
    Sample Rate
    for exceptional high frequency sound clarity
  • Playback
    for multiple whistle lengths and patterns
  • Choice
    of 3 selectable Whistles / Horns
  • Alternate
    Whistle / Horn
    where applicable for locomotive with air horn
    and steam whistle – both the main whistle and alternate can be easily
  • Adjustable
    bell ringing interval
    for faster or slower bell
  • Numerous
    functions with available keys
  • Johnson
    Bar Sound
    at Direction Change (Steam Only)
  • Passenger
    Station Ambient Sounds
    – Controlled with Function Key
  • Freight
    Yard related radio chatter
    – Controlled with Function Key
  • Lumber
    Yard Ambient Sounds
    – Controlled with Function Key
  • Farm
    related radio chatter
    – Controlled with Function Key
  • Crew
    Radio Communications
    – Controlled with Function Key
  • Maintenance
    Yard related radio chatter
    – Controlled with Function Key
  • Demo
    for display and demonstrations
  • Grade
    Crossing Signal
    – Controlled with Function Key
  • Simple
    with Integral DCC Decoder
  • Automatic
    Forward / Reverse Signal
    – When activated, stopping triggers
    and stop whistle toot.  When moving forward from a stopped
    position, toots twice.  When moving in reverse. toots three
  • Engine
    sound intensity varies with load
  • Individually
    adjustable sound volumes
    for most sound effects