WM J1 Potomac


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Select 2009, 2010, 2012 Pre Sp1, Mac 1 if you use:
Trainz 2009, Trainz 2010, Trainz 2012 - Build 49922 or Trainz Mac 1

Select 2012 Sp1, T:ANE, Mac 2 if you use:
Trainz 2012 Sp1 - Build 57720 or higher, Trainz New Era or Trainz Mac 2

How to find your Trainz build number:

  1. Open the Trainz App on your computer
  2. Before launching the game, locate the 5 digit build number on the bottom right corner of the launch window


  •  3 Part Echo Whistle
    3 Part Echo Whistle
  •  Animated Bell
    Animated Bell
  •  Animated Coal Load
    Animated Coal Load
  •  Auto Running Numbers
    Auto Running Numbers
  •  Bill & Steve Cab Figures
    Bill & Steve Cab Figures
  •  Blueprint Design
    Blueprint Design
  •  Multiple Outside Views
    Multiple Outside Views
  •  Reverse Headlight
    Reverse Headlight
  •  Secondary Blowdown
    Secondary Blowdown
  •  Tender Outside Views
    Tender Outside Views


The Western Maryland took delivery of (12) 4-8-4’s in 1947 from the Baldwin Locomotive Works. Rather than naming them “Northerns” like most railroads, the WM chose to name them Potomacs. They were classified as the J-1, and numbered from 1401-1412. These locomotives were massive! Their boilers were nearly 9ft in diameter! Saddled on (8) 69″ drivers, the Potomacs weighed in at 506,500 lbs, and produced 70,600 lbs of tractive effort when running at 255 boiler psi. At 45mph, the Potomacs head nearly the same performance as the even larger M-2 4-6-6-4 Challengers. They were very liked by the engine crews, mostly because of the enclosed all-weather cabs, and the (4) wheel trailing truck provided extra comfort. Timken roller bearings were fitted on all engine and tender axles and on the back end of the eccentric rod. All link motion pins used needle bearing and the drive wheels were of the Box Pox design. The trailing trucks were designed to accomodate a booster engine, but they were never added. On the 1.75% grade west out of Cumberland, MD, the Potomacs were limited 1180 tons unassisted. On level track, they were capable of handling upwards of 5500 tons. 8000 tons was the limit for downhill runs. The Potomacs ended up being the last steam locomotives the WM received new before dieselization began.

All of the Potomacs were retired in 1954, being stored in Hagerstown and Cumberland until 1957 when the equipement trusts ran out, resulting in their inevitable scrapping.

None of the (12) Potomacs were preserved.

WM J1 Potomac set includes: (2) Engines and (2) Tenders

Product Installation

  1. Download the file included in your order confirmation email or from your account downloads.
  2. Launch your Trainz Content Manager.
  3. Drag the downloaded cdp file into the content manager window.
    While in content manager, go to FILE on the top left and select "import cdp" or "import content", find your downloaded cdp and select.

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