Prototype Railroad Topics
Friday, March 27, 2026
Pennsylvania Railroad G28 Gondola in HO
Thursday, March 26, 2026
70-ton National Type B and B-1 Trucks from Plate C
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| Plate C National Malleable Type B 70-ton Truck |
Plate C Model Prototypes is set to release 70-ton versions of the National Malleable Type B and B-1 trucks in HO scale. This is (to my knowledge) the first time these have been available in HO and perhaps, any scale. The fact that we will have both of these available is fantastic. The visual differences in HO are quite small. The B-1 incorporated updated trunnions that modified the arrangement (and appearance) of the spring package. The easiest way to discern the Type B from the Type B-1 is that the spring in the Type B "filled" the area below the bolster while on the B-1 you could "see" around the front spring and the B-1 also had a raised area around the small circles at the bottom of the sideframe casting, presumably for added strength. Again, subtle, but noticeable. IYKYK. These will be available from 3D Central
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| Plate C National Malleable Type B-1 70-ton Truck (directly above and below) |
National Malleable Type B 70-ton trucks, known applications
| Road | Series Start | Series End | Class | Type | Notes |
| ACL | 739200 | 739299 | U-7 | Covered Hopper | Phosphate |
| ACY | 515 | 539 | Covered Hopper | equipped with Timken roller bearings | |
| ATSF | 170925 | 170974 | GA-55 | Gondola | AAR 65' |
| ATSF | 86200 | 86499 | GA-56 | Hopper | Hart Ballast |
| ATSF | 86500 | 86799 | GA-59 | Hopper | Hart Ballast |
| ATSF | 77000 | 77399 | GA-64 | Hopper | Hart Ballast |
| ATSF | 91142 | 91191 | FT-U | Flat | 60' |
| DMIR | 4950 | 4959 | Covered Hopper | ||
| DOWX | 38123C | Tank | |||
| CB&Q | 180000 | 180099 | HC-1 | Covered Hopper | |
| C&IM | 7350 | 7449 | Gondola | Offset sides | |
| CN | 118000 | 118999 | Hopper | ||
| CN | 142050 | 142749 | Gondola | 48' | |
| PRR | G26 | Gondola | 65' | ||
| PRR | G26A | Gondola | 65' | ||
| PRR | 344815 | 345182 | G27 | Gondola | |
| PRR | 342600 | 343549 | G28 | Gondola | |
| PRR | 357854 | 358653 | G29 | Gondola | |
| PRR | see link | see link | G30 | Gondola | Emergency; http://prr.railfan.net/freight/classpage.html?class=G30 |
| PRR | 254451 | 254550 | H30 | Covered Hopper | slightly different sideframe |
| PRR | 254951 | 255026 | H30 | Covered Hopper |
| Road | Series Start | Series End | Class | Type | Notes |
| ATSF | 169700 | 169899 | GA-63 | Gondola | Emergency |
| CB&Q | 180200 | 180249 | HC-1 | Covered Hopper | |
| D&TS | 2028 | 2077 | Covered Hopper | ||
| Erie | 11150 | 11249 | Gondola | Greenville design | |
| NKP | 91000 | 91049 | Covered Hopper | ||
| NSS | 1300 | Gondola | |||
| PRR | see link | see link | G30 | Gondola | Emergency; http://prr.railfan.net/freight/classpage.html?class=G30 |
| T&NO | 4200 | 4449 | Hopper | ||
| WP | 6501 | 6600 | Gondola | Greenville design | |
| CB&Q | 221500 | 221749 | Hopper | Ballast; Emergency |
Thursday, March 5, 2026
Norfolk & Western S-1a 0-8-0 number 231
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| Portsmouth, Ohio, November 15, 1958, Charles Judy photo |
This post is not really related to anything in particular except my love of small-drivered steam. This is an original slide that I snagged on ebay for a very reasonable price. It also scratched my itch for these types of steamers. The S-1a class was the last group of steam locomotives built at N&W's famed Roanoke shops, with 45 constructed between 1951 and 1953 (nos. 200-244.) They were short-lived, being retired between 1958 and 1960. Enjoy!
Saturday, February 21, 2026
Frisco USRA-design Composite Gondolas
There are certain freight car prototypes that just appeal to me, whatever the reason. The Frisco's USRA-design composite gondolas are one such car. When they were built, composite gondolas were commonplace, but by the early 50s, all steel gons were by far the majority. Perhaps that whiff of obsolescence is what draws me. Regardless, I find them interesting and have wanted to model one for years.
Before discussing modeling options, I will provide what I know about the prototypes. The Frisco had a large number of these cars and seemed to refurbish and rebuild them into an incalculable number of flavors. There was a group of true USRA composite gondolas, built in 1919 by Standard Steel Car Co., in series 85000-85999 (782 cars in the Official Railway Equipment Register, October, 1951.) These were rebuilt into a number of different configurations:
- largely as built, but with wood floors and no drop doors and either original Perfection lever-type hand brake or Ajax power hand brake and AB brakes with 1712 cu. ft. capacity, like 85825 shown below (389 cars, Official Railway Equipment Register, October, 1951)
- rebuilt in 1934, 1935 and 1937 with paneled steel sides, wood floors and no drop doors, new side steel structural members, and either 1842 or 1862 cu. ft. capacity (4 and 138 cars, respectively)
- rebuilt in 1936, 1937 and 1938 with paneled steel sides including three side doors per side, wood floors and no drop doors, Dreadnaught ends, new side steel structural members, and 1856 cu. ft. capacity, like 85012 shown below (151 cars)
- rebuilt in 1940, retaining composite sides, but adding three doors per side, Dreadnaught ends, wood floors and no drop doors, Ajax power hand brakes, and 1726 cu. ft. capacity, like 85885 shown below (100 cars)
The image above is of the side of Sunshine kit 92.6. These were part of the re-release of Frisco USRA-design gons. I assume that the patterns were Martin's work as no one is credited for them in the Sunshine PDS (Prototype Data Sheet) and Martin did do occasional pattern work, especially for his "pet" roads, of which the Frisco was one. The cars included detail on the interior, as well, including "cutouts" for the side discharge doors, wood boards, and detail on the inside of the Dreadnaught ends.
Monday, February 16, 2026
The "Murphy" "XLA" "Flexible" "Outside Metal" Roof
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| Murphy XLA on a Minneapolis & St. Louis USRA design 40-ton double sheathed box car. Jack Delano photo, Chicago and North Western Proviso Yard, FSA-OWI Collection, Library of Congress |
During the 'teens and into the early 20s, the most common roof design on house cars was the "Murphy" roof. The roof went by many names, including Murphy and Murphy XLA as used commonly by hobbyists, as well as Outside Metal and Flexible Outside Metal. Standard Railway Equipment Co. was the primary purveyor, although it seems likely that it would have been licensed as needed.
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| Car Builders' Cyclopedia page illustrating the Murphy XLA roof design |
Seemingly everyone with even a casual interest in freight cars is aware of this roof design and could easily point it out on models. What is less well known and is the reason for this post, is how the roof actually worked. But first, modelers who replicated this design, especially scratchbuilders, typically took sheet styrene and added strips at the correct (or incorrect!) spacing to simulate the battens. What is frequently overlooked, yet is easily modeled, is the lip at the eaves that was part of the design's effort to mitigate water seepage.
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| Detail from an L&N box car drawing illustrating some of the details of the "Murphy Improved Pivoted Outside Metal Roof" |
Back to the prototype... the edges of the roof sheets, batten coverings, peak coverings, etc., incorporated pressed, rolled edges that interlocked in such a way that it would be difficult for water to enter the seams and joints. In a static setting, this was probably quite a good solution. However, the forces imparted on railroad cars over years of service could result in areas of leakage. Likely by design, the roof seemed to be quite serviceable, meaning any issues could be resolved in the shops.
Returning to modeling... the overlap of interlocking roof sheet and flexible eave can easily be simulated by making the roof slightly "short" at the edge and adding an abutting strip. The battens over the roof sheets can continue over the strip, simulating this detail. It is something I have added to such efforts once I became aware of it. A roof without this detail could be fixed also, by making an angle of an appropriate depth piece of styrene that "sits" in the appropriate distance, allowing you to lightly scribe lines between the battens. One interesting detail is that the batten strips do not seem to be uniformly designed. Some appear to extend almost to the edge of the roof eave while others terminate more midway between the lip of the roof sheets/flexible eave and the angle of the eaves. Happy modeling!
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| This car, a Milwaukee Road prototype, also illustrates different width panels on the roof. Jack Delano photo, Milwaukee Road Galewood, Illinois Yard, FSA-OWI Collection, Library of Congress |




















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