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N Scale - BLMA - 19018 - Covered Hopper, 5-Bay, Trinity 5660 Pressure Differential - North Dakota Mill - 77196

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N Scale - BLMA - 19018 - Covered Hopper, 5-Bay, Trinity 5660 Pressure Differential - North Dakota Mill - 77196 Authorized use by TroveStar from copyright owner.

Brand BLMA
Stock Number 19018
Original Retail Price $29.95
Manufacturer BLMA
Image Provider's Website Link
Body Style BLMA Covered Hopper 5-Bay Trinity 5660 PD
Prototype Description Covered Hopper, 5-Bay, Trinity 5660 Pressure Differential
Road or Company Name North Dakota Mill (Details)
Reporting Marks CEFX
Road or Reporting Number 77196
Paint Color(s) Gray with Yellow Conspicuity Marks and Black Lettering
Coupler Type Generic Magnetic Knuckle
Wheel Type Chemically Blackened Metal
Wheel Profile Small Flange (Low Profile)
Release Date 2016-06-01
Item Category Rolling Stock (Freight)
Model Type Covered Hopper
Model Subtype 5-Bay
Model Variety Trinity 5660 Pressure Differential

Model Information: Introduced by BLMA in 2016, the first release became available for purchase in June of that year. Atlas acquired BLMA in late 2016, and began re-releasing this model in November of 2017.

These scale models feature injection-molded plastic bodies, etched metal roofwalks, wire cut levers, body-mounted knuckle couplers, trainline air hoses, metal wheels, Separately Applied Wire Cut Levers as well as crisply painted lettering.

Prototype Description: As covered hoppers evolved in the 1960s, larger cylindrical and rounded car bodies were introduced. This shape allowed more material to be carried and used gravity to force the load toward the bottom discharge outlets. Some of these designs also used pneumatic unloading systems. The continued demand for larger cars led Trinity Industries to introduce their new Power-Flo pressure differential (PD) hoppers in 1987. The design utilized proven technology by combining a pressurized system with rounded side walls. This allowed for increased payload, and reduced the time needed for loading and unloading.

The 5660 Pressure Differential (PD) Covered Hopper was introduced in 1999, by Thrall Industries, as the most advanced design in the evolution of Pressure Differential Covered Hopper, a special breed within the covered hopper family. Production still continues today under the TrinityRail brand, following Trinity's purchase of Thrall, with nearly 4,000 examples already built.

These PD covered hoppers, unlike traditional 'gravity discharge' covered hoppers, feature five non-opening hopper bays all connected by a master commodity discharge pipe and an air inlet pipe spanning the length of the underbody. Unloading of these cars is an orchestrated process: an air source is connected to air pipe, which pressurizes the interior of the car to approximately 15 psi, although 14.7 psi is recommended for the Thrall/TrinityRail 5660. As air pressure inside the car's body begins to build and exceeds that of the external environment, the basic physics of differences in air pressure (hence the name 'Pressure Differential Covered Hopper') forces the air outside of the car, whisking the car's contents along with it through the commodity discharge pipe. This type of unloading is necessary for the seamless unloading of dry, powdery, light-density commodities such as flour, starch, talc, fly ash, bentonite, and other powdery substances which would otherwise 'cake up' if being unloaded from a traditional gravity-discharge covered hopper.

Brand/Importer Information:
BLMA Models was founded in July of 2000 to bring Z, N, and HO Scale products of superior quality and originality to the model train community. At BLMA Models, we understand that quality and accuracy count in producing realistic scale models. Our passion revolves around accuracy, diversity, innovation and satisfaction to prototype model railroaders by providing exceptional products and service that goes beyond your expectations.

BLMA was acquired by Atlas Model Railroad in January of 2016.

Item created by: gdm on 2016-06-27 12:25:05. Last edited by gdm on 2016-06-27 15:25:05

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