N P3 PRR M1b 4-8-2 Steam Loco #6733/DC/DCC Sound

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 –
6799.

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!

Locomotive
features:

• 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
Features:

• 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
  Whistle 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
  played
• Adjustable
  bell ringing interval for faster or slower bell
• Numerous
  user-mappable 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
  Mode for display and demonstrations
• Grade
  Crossing Signal – Controlled with Function Key
• Simple
  Programming 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
  times.
• Engine
  sound intensity varies with load
• Individually
  adjustable sound volumes for most sound effects