7mm Richards P48 US Thread

[richard carr]

Hi Jordan

I don't know is the simple answer, but I do know that your BNSF loco is different to the SP ones, yours is Dash 8 -40B (at least I think it is) mine is a Dash 8-39B, the air tanks are in different places, mine has one at each end of the fuel tank.

Sorry that didn't help at all.

Richard

 

[Scale7JB]

I did a similar thing with my Atlas BNSF Dash-8, I used two strips of Plasruct [-section channel to fill in the gap from over the fuel tanks back over the rear truck.
Once painted it's difficult to see, but does block out unwanted 'daylight'.
View attachment 207298

View attachment 207299

View attachment 207300
Meanwhile, a question if I may - what route does the air pipe to the brake cylinder take over the truck frame? As seen here, the Atlas pipe just ends rather vaguely floating in mid-air, & doesn't look very good at all....

Looks like you have it right Jordan. I feel sure there would have been a bracket to mount the pipe to the truck frame, rather than getting caught by random detritus.

JB.

 

[Yorkshire Dave]

Meanwhile, a question if I may - what route does the air pipe to the brake cylinder take over the truck frame? As seen here, the Atlas pipe just ends rather vaguely floating in mid-air, & doesn't look very good at all....

I've some more pics of the trucks on my Dash 8-40B with the air lines I made. I'll dig them out tonight.

 

[mickoo]

View attachment 207307

Looks like you have it right Jordan. I feel sure there would have been a bracket to mount the pipe to the truck frame, rather than getting caught by random detritus.

JB.

The pipe and bracket is only on one bogie at one end and one side (cab RH side), it's a chain tube for the handbrake chain. The hand brake only pulls on one cylinder clevis and sets the brakes to whatever that is connected to, in some cases just one wheel.

The external handbrake chain is a GE feature (older builders, Alco, Baldwin etc may have had something similar but I focus on more modern stuff) and present today on GEVO's etc, but without the tube, the tube seems most prevalent on B trucks.

GEVO truck and hand brake chain, pulled on (note extended brake cylinder piston). Handy tip, if you're up close to these (photographing DPU's or mid train helpers) and you see the silver shaft it's not going to go, the minute they pull in then there's a good chance it'll move so step back.



EMD are more discreet, the chain is buried up under the frames toward the middle of the engine. Spartan cab models have the handbrake at the front on the LH side nose.



On comfort cabs the handbrake has been moved to the radiator section on the RH side; the 70M it drops down below the frame and runs forward a few feet before diverting down again in the depths of the truck.



On the ACe it drops straight down from the handbrake wheel to the truck.



Regarding GE'B's air lines, they turn 90° and head into the middle of the engine to a connection with a flexible hose to the chassis.





Another anorak let loose from the closet, I've only just managed to catch the DB steam one and stuff it away

 

[timbowales]

The pipe and bracket is only on one bogie at one end and one side (cab RH side), it's a chain tube for the handbrake chain. The hand brake only pulls on one cylinder clevis and sets the brakes to whatever that is connected to, in some cases just one wheel.

The external handbrake chain is a GE feature (older builders, Alco, Baldwin etc may have had something similar but I focus on more modern stuff) and present today on GEVO's etc, but without the tube, the tube seems most prevalent on B trucks.

GEVO truck and hand brake chain, pulled on (note extended brake cylinder piston). Handy tip, if you're up close to these (photographing DPU's or mid train helpers) and you see the silver shaft it's not going to go, the minute they pull in then there's a good chance it'll move so step back.

View attachment 207311

EMD are more discreet, the chain is buried up under the frames toward the middle of the engine. Spartan cab models have the handbrake at the front on the LH side nose.

View attachment 207314

On comfort cabs the handbrake has been moved to the radiator section on the RH side; the 70M it drops down below the frame and runs forward a few feet before diverting down again in the depths of the truck.

View attachment 207316

On the ACe it drops straight down from the handbrake wheel to the truck.

View attachment 207315

Regarding GE'B's air lines, they turn 90° and head into the middle of the engine to a connection with a flexible hose to the chassis.

View attachment 207312

View attachment 207313

Another anorak let loose from the closet, I've only just managed to catch the DB steam one and stuff it away

Those last two photos look the loco has left the rails? Is that an optical illusion?
Tim T

 

[mickoo]

Yes, main lines in foreground are higher and super elevated.

 

[Big Train James]

Couple of things on the b40-8 truck air piping.....

The condition is not the same on both sides of the locomotive. Both trucks on the left side of the loco having piping like Mick's photo above. To answer JB's point about attachment of piping to the truck, the tubing is held by clips or straps welded to the frame in at least three places.



On the right side of the loco, the air piping runs from the cylinder, past the tee where the rubber hose connection is made, then across the face of the bolster, at which point there is another tee with the straight continuing a short distance to a plug. The 90º leg of the tee is a pipe that disappears into the the guts of the truck, and I'm willing to bet that it's the same pipe that is seen feeding the brake cylinder on the other side of the truck. The photo has been overexposed to show some extra detail.



Lastly, to add to Mick's points about the handbrake applications, EMD sd40-2's also have a very visible handbrake chain.

 

[Big Train James]

.........This close up shows how the gap has virtually been closed (and some of the other bits I have made and added).

View attachment 207281

I really need to get back into finishing the model but haven't had the enthusiasm over the last few years. I'll get around to it one day.

Dave,
That's a nice detail to split out the rod connecting the brake shoes. It's a detail I never noticed before about this type of truck. I now see how it is cast into the sideframe on Jordan's stock version.

Also, a question about the spare knuckle mounted to the truck. What did you use for that? I've been working on replacement pilots for an MTH c40-8, and have included the spare knuckle brackets. I have considered modeling the knuckle so I could print it, but I also like the idea of one in brass instead. Curious as to the source.

Jim

 

[mickoo]

Couple of things on the b40-8 truck air piping.....

The condition is not the same on both sides of the locomotive. Both trucks on the left side of the loco having piping like Mick's photo above. To answer JB's point about attachment of piping to the truck, the tubing is held by clips or straps welded to the frame in at least three places.

View attachment 207331

On the right side of the loco, the air piping runs from the cylinder, past the tee where the rubber hose connection is made, then across the face of the bolster, at which point there is another tee with the straight continuing a short distance to a plug. The 90º leg of the tee is a pipe that disappears into the the guts of the truck, and I'm willing to bet that it's the same pipe that is seen feeding the brake cylinder on the other side of the truck. The photo has been overexposed to show some extra detail.

View attachment 207332

Lastly, to add to Mick's points about the handbrake applications, EMD sd40-2's also have a very visible handbrake chain.

View attachment 207333

Well everyday's a school day, I'd have wagered EMD C trucks had internal handbrake chains, of course I only checked my B truck photos, that'll teach me to be so lazy

So, making amends I trawled through and the external chain appeared with the dash-2 model on the C truck but remains internal on the B truck throughout, no doubt there will be some external ones but I've not found one as yet.

 

[Big Train James]

I'd be surprised if you found an external chain on an Blomberg or Flexicoil switcher trucks, if you did I think it would be an extremely odd occurrence.

Both the Blomberg and Flexicoil trucks have an extension on one of the levers that connect the cylinder rod to the brake hanger. Location varies between the two, with the Blomberg on the left side while facing the sideframe, and the Flexicoil on the right side.

Blomberg


Flexicoil


In either case, the connection point is well inside the rear face of the sideframe, actually under the frame itself.

 

[mickoo]

I'd be surprised if you found an external chain on an Blomberg or Flexicoil switcher trucks, if you did I think it would be an extremely odd occurrence.

CMA

Covering My A**

 

[Big Train James]

CMA

Covering My A**

Always prudent.

 

[mickoo]

Always prudent.

The bane of social media, the minute you write something and fail to disclose 'to the best of my knowledge' you run the risk of being taken to task for spreading untruths and ye shall be cast on the fires of damnation

 

[Big Train James]

You'll notice that I left plenty of wiggle room myself. "I believe" or "I think" or "may be" are always close at hand.

 

[Yorkshire Dave]

Also, a question about the spare knuckle mounted to the truck. What did you use for that? I've been working on replacement pilots for an MTH c40-8, and have included the spare knuckle brackets. I have considered modeling the knuckle so I could print it, but I also like the idea of one in brass instead. Curious as to the source.

The spare knuckle was from a Protocraft coupler and I made up the trays from scrap brass etch.

 

[Yorkshire Dave]

Meanwhile, a question if I may - what route does the air pipe to the brake cylinder take over the truck frame? As seen here, the Atlas pipe just ends rather vaguely floating in mid-air, & doesn't look very good at all....

Here are the pics of the air lines I made up from brass wire and tube using a photo of a Cotton Belt Dash 8-40B. The black flexible hose is 0.3 mm ID neoprene carp fishing rig. This also shows the new sand lines I made up.







Edited to add two annotated photos.

 

[Yorkshire Dave]

That's a nice detail to split out the rod connecting the brake shoes. It's a detail I never noticed before about this type of truck. I now see how it is cast into the sideframe on Jordan's stock version.

As I had drawn the truck sides inwards for P48 I cut off the moulded brake rods and shoes. The new brake shoes are whitemetal and the rodding made up from brass tube and scrap nickel silver etch. Then they were installed in line with the wheel treads.

 

[oldravendale]

The bane of social media, the minute you write something and fail to disclose 'to the best of my knowledge' you run the risk of being taken to task for spreading untruths and ye shall be cast on the fires of damnation

Won't be the first time for you, will it Mick?

 

[Jordan]

Here are the pics of the air lines I made up from brass wire and tube using a photo of a Cotton Belt Dash 8-40B. The black flexible hose is 0.3 mm ID neoprene carp fishing rig. This also shows the new sand lines I made up.

Great pictures, thanks.!!
That amount of extra detail, though ...getting perilously close to "wish I hadn't asked" territory....

 

[Yorkshire Dave]

Hehe - I have rather hoisted myself by my own petard though, by setting out my detailing levels with my SSW GP9.