Tag Archives: Atlas

Modeling an ex-CofGa 70T Hopper

SOU 70T ex CofGa 1
Side-by-side of an MDC car (left) and Atlas car (right) showing the slight length difference

In the last post, I mentioned some of the work that went into creating an ex-Central of Georgia 70T rib-side hopper from an old MDC Roundhouse kit. Atlas makes a much more crisp and better operating out-of-the-box car in its Trainman 9-panel, 70T hopper that is a good stand-in for this car, but it’s about 2 scale feet too long. The Atlas kit, however, is a great model for the Southern’s mainstay fleet of 70T hoppers in the 70300-73749 and 281000-281299 series which far outnumbered the ex-CofGa cars in the 74100-74584 series–all you have to do is remove the heap shields and renumber them. The MDC Roundhouse kit can be picked up in Southern paint pretty cheaply. It’s a far WORSE model both dimensionally and detail-wise to match the Southern’s main fleet of 70T cars, but its overall dimensions are closer to the ex-CofGa cars. However, it requires a ton of work to make the car presentable in a string of more recently produced and more detailed cars. So, is it worth the work? Spoiler alert: it’s not worth it unless you’re just a crazy hopper person like me who notices the subtle length difference between these different series of cars in a long string of hoppers.

Ok, if you’re still reading, here’s a little more on what it takes to model one of the ex-CofGa cars using an MDC Roundhouse kit or one of the slightly improved Athearn versions. First, what’s wrong with the model out of the box? These molds are at least 40 years old, so the detail is sub-par–the rivets are clunky, the grabs are thickly molded, the brake platform and brake wheel housing is grossly under-modeled, the brake wheel is horrendous, and it’s just missing some details like the long grabs on the left ends of the car and bracing inside the car. Also, the bottom sills and corner posts are super thick at the ends. The interiors have an ugly scar right in the middle where the injection molding was done. The most egregious issue is also the most likely to escape notice (so I didn’t bother fixing it): the middle hopper bay is reversed with respect to the brake end. The lettering is not up to today’s standards but acceptable for a car that will be weathered, but there is no lettering on the ends of the MDC cars. The car also comes with arched heap shields that can be added, but they’re a little too short to look right, something that I initially ignored but eventually remedied by replacing them with parts off an Atlas car. It’s also missing details that were on the CofGa cars like slope sheet bracing on the ends.

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Detail differences between the original model (right) and the modified model–note the difference in the side sill width

I remedied most of these issues with an X-Acto blade. I started by removing the angles between the bottom sills and the side panels. Next I worked on the side/bottom sills and carved away excess material from the top and bottom with a No 11 X-Acto blade (leaving essentially just enough for the “PULL HERE” lettering). This was done to both the ends of the sides and the ends. I also removed the excess material from the left-side corner posts with a blade (I left the ladder side alone) and cleaned up the excess plastic in the steps. I narrowed down the ladder grabs with the X-Acto blade using repeated small cuts on the back side and alternating between top and bottom until the grabs were essentially round-ish instead of rectangular. I also used a chisel blade to remove the awkward rib down the center of the underside of the slope sheets. Finally, I removed the molded-on grabs from the lower ends adjacent to the couplers.

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Details added include tack boards, grab wires, tow rings, cut bars, and train line

Next came the added styrene bits. I added some flat bits for the tack boards and the panels where the coupler cut bar would attach. Some large triangles (using the Atlas cars as a model) became the interior bracing. The most complex part was the slope-sheet bracing under the ends. I made these from three pieces of L-girder styrene and just dimensioned and cut them to resemble photos. I also replaced the brake wheels with more detailed Miner wheels from the parts bin (one Kadee and another whose origin is lost). I added wire grabs adjacent to the couplers, and added custom-bent long grabs on the left ends made from .012″ brass wire and tow loops made by bending .012″ brass wire around a thumbtack (I bend them into a “J” shape and just drill one hole). I bent coupler cut bars and eye bolts from .012″ brass wire using a little jig I made. I also added a couple pieces of brake-gear piping between the reservoir and triple valve bent from .020″ brass wire. The train line is a piece of copper wire from an old ethernet cable sandwiched between two pieces of L-shaped styrene. The final details included Kadee No 5 couplers, Intermountain metal 33″ semi-scale wheels (faces, backs and axles painted black), and arched heap shields salvaged from Atlas models (the in-progress photos here show the MDC arches which I replaced before weathering). Some careful carving and putty fixed the ugly scar on the center sill inside the car.

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Detail differences on the ends

I wanted to renumber the cars and detail them for the early ’70s, so I removed a couple of the numbers and the black-and-white lube stencils the best I could by scraping them off with the back of an X-Acto chisel blade. I custom-mixed some paint to match the body and covered all the new details and scraped sides. I added the new numbers, ACI labels, and end reporting marks using a combination of Microscale, Herald King, and K4 decals. Now they were ready for weathering!

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Interior detail including braces and covering up the injection mold scar

For weathering, I started with some drybrushing of dark rust spots in a few places on the sides. Next I airbrushed them moderately using a combination of flat black and dark tan airbrushing and washes. Since these are old cars that have been repainted, I went a little heavier than usual with the black on the interiors. I hit them with a wash of flat black paint and water, letting it sit for a minute and then wiping it off vertically to produce some rain streaking and shadows on the details. I used a wash of light orange rust and water on the interior and then added some drybrushed rust spots inside.

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String of Atlas and MDC cars mixed in–the differences are subtle but noticeable

In all, these cars took probably 4x as long to detail and make layout-worthy as the Atlas Trainman cars. Now that they’re complete, I do like seeing the more stocky look of these CofGa cars mixed into a long string of Southern-heritage 70T cars. So much so that I’ll probably eventually go back and take all the heap shields off my Atlas cars and renumber them into non-CofGa series. Thankfully I’ve only completed 3 of these Atlas models, so it’s not a huge sacrifice. So, if you’re a hopper nut like me and nerd out on seeing the subtle differences between car series, then knock yourself out on a project like this! If you’re not a hopper nut, I recommend sticking to the Atlas models and saving yourself a lot of trouble.

 

 

 

Hopper Class of April 22

16 Finished Hoppers
The 16 hoppers of the April 2022 class finished and ready for the next session

The St Charles Branch would like to welcome the Southern Hopper Class of April 2022 to the roster! The 16 cars in this graduating class are the largest group of cars I’ve ever finished at one time (and probably the largest group I’ll EVER attempt at one time). The 16 hoppers, including a foreign exchange student from the Clinchfield, represent cars across the layout’s range of ops session eras from mid ’60s (cars still in roman font) to the mid ’70s (brand new 100T hoppers). Consequently, all were weathered a bit differently from a 55T twin with dents and lots of grunge to brand new with just a little grime on the trucks and underside.

70T Hoppers
A Tangent 70T PS3 clone next to an upgraded Atlas Trainman car

A few of the cars (CRR 70T and 50T extended-height war-emergency rebuild) have been complete and just awaiting weathering for several years. Some of the cars have been running on the layout for a while but didn’t yet have their full set of details or weathering. The bulk of the cars are Atlas 70T Trainman hoppers, which I love because they’re relatively cheap but have good wheels and trucks and great paint for budget cars. Some Trainman hoppers got a full set of new grabs (did this a while ago). Most Trainman hoppers (along with a pair of Bowser/Stewart 12 panel hoppers) got the standard treatment of getting the grabs shaved down to a more reasonable thickness front-to-back using an X-Acto blade. Other added details include Kadee #5s, plastic bits for tack boards and door bars, wire grabs adjacent to the couplers, homemade tow loops, homemade train lines (copper wire from Cat 5 cable), and homemade coupler cut bars (bent from .012″ brass wire on a homemade jig). A few got dents added in the top sill by softening them with a 100W lightbulb. A few of the cars came with heap shields (correct only for a small number of ex Central of Georgia cars) that got removed as well. I also swapped out the trucks on the Tangent 100T cars–I decided I wanted cars that roll well more than neat spinning roller bearings.

Atlas 70T Southern Hoppers
Two of the more heavily weathered hoppers of the batch–note the dents in the top sill of 70439

All but one of these cars is factory painted which saves a TON of time. I changed some of the numbers by scraping them off gently with an X-Acto chisel blade (along with the later round “O”s on some of the Atlas cars) and replaced them with decals. Most cars received ACI labels (1967+) and a couple got lube plates (1974+). Before weathering, I covered some of the weight and shop stencils with rectangles of masking tape to represent re-stenciled cars. I ran them through a weathering assembly line that included coats of various thickness of airbrushed flat black followed by light tan. I then painted out a few more weight panels with fresh oxide red and added some stencil data in a different font to a couple cars. A few of the cars got some drybrushed rust marks too. Finally, most of the cars got a wash of flat black inside and out. Overall I’m really happy with how they turned out, but I don’t think I’ll ever assembly line 16 cars again… do you know how many wheel faces that is to paint? 16 cars x 8 wheels x 2 faces per wheel = a ton of wheels (that’s 128 wheels and 256 faces… don’t hurt yourself doing the math)! Still, it will be worth it to see coal trains with a lot fewer shiny cars in the mix.

Tangent 100T hoppers
The Tangent hoppers represent cars built in 1975 so weathering is minimal