📌Car Weight Standard - RP-20.1 NMRA Standard and Recommended Practices - NMRA Car Weight Standard
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- Опубліковано 10 лют 2025
- 📌 Car Weight Standard - RP-20.1 NMRA Standard and Recommended Practices - NMRA Car Weight Standard 📌 Set up N Scale Cars to NMRA Specifications 📌 Set up HO Scale Cars to NMRA Specifications - How To Improve Rolling Stock Performance adding weight to rolling stock - adding weight to railcars - how to adding weight to rolling stock for beginners
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📌 - NMRA RECOMMENDED PRACTICES
RP-20.1 Car Weight www.nmra.org/s...
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Nice video on a good subject. There is no doubt that weight makes a significant difference in how cars run. I like your chart. I think the RP still works. I know some like to really overweigh their cars, and that is ok, but the RP leads to the least necessary weight for optimal performance. BTW, that is 3 oz on the HO car....and you must have uploaded this at like 3 a.m. Now you are just trying to show me up on my upload morning. Oh well, I got mine up on time today. Thanks for the the great video. 👍
Thanks Ron.
Thanks Eric, for a very thorough explanation of weighting cars and I think your scale is super.
Thanks , Mike
Thanks mike
I have foundover the years it's a good practice to make sure your cars are better preforming if you follow those are best, the idea of using the chart looks GREAT, thanks for the idea....😃
Thanks
I use a process similar to yours only in HO scale. RP-20.1 has always worked for me and I intend to keep using it...Harold
Cool
Eric, good to see another video from you. Very helpful. I find the NMRA guidelines very useful. Thanks.
Thanks, and maybe some more
I havent forgotten about the carbon. I'll get it out as soon as I can. Work has been crazy.
Thanks james, I like I said no worries.
excellent, couldn't be better. thank you
Mike, Thank you very much!
Hey Eric, you left your shades on inside. :-)
Helpful vid- thanks for posting!
Always
your weight chart is very helpful to me. how does on go about getting a copy of your car weight chart
I will be setting up a way fairly soon.
In Canada an ounce is 28.34952 gms. US and Canadian oz different so my chart means at 4.0 inches its almost 3 grams lighter. So, I could go a little heavier?
Hi Eric, this video of yours was very helpful......great actually ! I made a similar scale as yours (your idea of course) and made a test track with the scale and micro-scale coupler height gauges at each end as well as a rerailer...works like a charm.I do agree 100% about using grams instead of ounces ,especially for N scale ,and being from Canada metric is king(although imperial is used to a degree) Using your modified document on my test track I tested a brand new Intermountain 4 bay Potash hopper (got them yesterday Jan.24/20) and measuring them at 4.25" they weigh in exactly at 32.23 grams...very nice hopper with metal wheels..beauty !Oh yah, I got my digital scale from Amazon yesterday too ,bonus.
Take care and thanks a bunch for this great video !!
Paul T in Canada
Thanks, and cool to be checking your stuff!
Hi so this has been almost 2 years has anything change for this. I'm HO scale. I have some 40 year old cars and they seem to be really lite. I tried to pull them but they keep derailing.
Did you put them on a scale and check the running gear for them?
@@IMRROcom not yet
@@IMRROcom I have to get a different scale the one i just tried won't work
question: what do you feed them cars to get heavier not flatter lol ( bulkhead car or a lumber rack cars )
I'm more or less stuck with them that way. but lead shot or tungsten puddy I will give a try
This is very great from 84yr.old man😊
Glad you enjoyed it
Thank You Eric..Needed this
Thanks
hi Eric... that was an awesome tutorial... this is something i need to do... thanks for sharing.. vinny
Watching your Lumber switching video right now. TU
Very useful info that I'll put into practice. Thanks for sharing that!
Thanks
Randy, thank you!! This is a great video that everyone needs to watch and apply! I found this out years ago but some cars are very hard to add weight too. If you have a center beam car with no load on it, should it weigh the same as a car that's loaded? What is the effect of having those extra grams on that car now? This is a TOP 2 video for me now and going to print that card out, thank you!
D. Muse
Sure give Randy all the Credit. And this is video is only in the top 2 and not number one...Yes all cars loaded or empty. You covering for the scale, not the real world. Load or unload get it to target. Small scale it is all the same. Extra wight just makes it harder for you power to pull the train.
Hey Eric Got a Microtrains Santa Fe Caboose A Coopala.. when this caboose was Rolling Down my Layout I could Here the Shell Rattling or maybe it was Plastic window Panels but Anyhoo I thought maybe adding some Weight to the Caboose would stop the Rattling I added 2# 1/4 Oz weights the Rattling stopped but is the Weight a Little to Over Kill I remember Dan Cortipassie i think i spelled that Right said he was Going add weight to his Caboose but I cant remember How much but he said since the Caboose is on the Tail end of the Train the little added weight would pull the slack out, But is 2 1/4 weights Way to much to Add just was Wondering and experimenting I took the little coil spring that Microtrains always puts on the Axle Cone to me the Spring is nothing more than something to lock up the Axle But I didn't throw it away..
THANKS Reply as Soon as you Get some Time cant wait to see more of your Videos.. Allen🤓🚂🚂🚂
interesting to note.
Great video thanks for the much needed info
Thanks mike
Great video, that is a tip for good operation....
thanks
Eric, great video. I was wondering if you have problems with "Slinky bounce" in your N Scale cars as they are traveling down the rails?
I do not pay attention or care about that. Not on my list of things to worry about. I do have a caboose that bob around. The better the cars roll the more they will bounce. add the MTL axle springs to your caboose
Thanks for the great info Eric..time to get a scale... thanks for sharing and keep up the great work.. Lance
Thanks
So...How did the non-existent PC 324326 weigh in?? Radial Forces?? Derailment?? Documents?? I think you (and/or Randy) are being affected by these "Radial Forces"!!!
Seriously, I think You did a great update to it.
Can I get a copy of your calculator?
I will have to dust off my scale-who knows where it is!!
Excellent Video Eric....and Randy-lol
I will get somthing set up for people to download.
Thanks Man!!
Thank you for the explanation. Would you care to share a copy of your N scale weight template? I never realized that there was that much difference between oz. and grams. Thanks for the video
Thanks, i'm setting that up for my patrons. I really have nothing else to give them so that is exclusive for them. Grams in "N" scale is the way to go.
IMRROcom Cool thanks I understand the patron thing however I am Patroned out at the moment... unless I get a raise or win the lottery!! LOL
I would love to see a video on what you use and how you weight you cars. Currently I have some very fine steel shot so I am curious as to how others are doing it. Between you and Ron I am learning lots. Thanks and keep it up.
It is not hard to make your own. Thanks. I hope you understand on that.
Where do I purchase the weight scale data sheet for train cars thnx
I need to make some up, update them and list them in my store. Maybe around this summer.
Most excellent - thank you! Did you ever finish the Prairie Co-op? New sub tonight.
I have a desk now...Read into that :)
Great video man. More people nees to do this.
Thanks
I'm curious as to how you came up with the ounces to grams equation, upon checking a conversion table 1.1 ounces = 31.1845 grams for which your chart is close, but well off on others. You also have repeating ounces on the 4.5-4.75", 5-5.5", 5.75-6.25" , 6.5-6.75", and the 7-7.5" cars with the same ounces but different grams for each. If the ounces are the same shouldn't the grams be the same?
Oz are based on NMRA calculations, Grams are adjusted to be more accurate. Most scales do not hold that many decimal points
There's 33g per oz. So grams are a longer scale. So take 7 oz. to 7.5 oz. that's a 16 gram jump. Grams are more precise.
Well thought out, and done.
Thanks
THANK YOU FOR DETAIL ON NMRA CAR WEIGHT STANDARD AS USE THAT IN {HO} SHORT LINE RAILROAD INDUSTRIAL.
Thanks
As far as updating it I don't think it needs it seems to work pretty well
Good the way it is, Me too.
Very useful explanation.
Thanks
Should it be updated? I don't think so, it gives us a place to start and a "ruler" by which to measure what we have.
True
you never mentioned what you used for weights. to bring the light cars up to standard.
Another video. That will show up later
harbour freight sells 1/2 oz wheel weights
RP20.1 does not specify a tolerance of the final weight. I would guess + or - 10% maybe even more would be reasonable. There are many variables that effect the amount of force needed to pull a train that the smaller increments of grams vs ounces is of no significant benefit. Updating RP20.1 would be a good idea. I wonder how many of us are still running cars that are 20 or 30 years old.
Wow, its a good thing you don't have 38,000 cars on your layout.
I know, 37,786 makes it so much simpler
I think the rp is still good . But i don't understand why the ready to run car's aren't.They are eather over weight ,or under. for the cost ,they should be right don't you think.Any way the right weight does help the performance of not only the car's but locos as well. Like always anther good video.
It might save in shipping cost. you shave 1 ounce of off each of your products. You have 5000 cars to ship. you have just shaved over 300lb. That is a huge savings on the bottomline when shipping from over seas.
Additional 2 oz weight is required.
:)
1 + 4 in x 1/2 = 3 oz. Looks like Ron got the same answer earlier.
Is this your final answer . . . :)
For $1,000,000.......Final answer.
In my opinion, the NMRA weight is too heavy in HO. It doesn't take into account the quality of the rolling stock available in recent years. I make my trucks as free rolling as possible. Quality track work will reduce the weight required. I too use grams versus ounces as grams are more precise. Last item, you can pick up a good scale in the kitchen department at Walmart. It's generally less expensive than office supply stores.
You swing the other way. I know and hear a lot of HO people want to overweight their cars by a significant amount. having stuff like a 60' box car at almost a pound. Or a small 2 bay coal hopper 8oz to 10oz. Seems like they are trying to double the recommended weight of the car. The little 12 or 13 car train we ran at my house was pushing the 2 engine set down the hill/2% grade. Model trains do not have brakes. I can see the problem
You've operated on my railroad. Much of my equipment is a bit under NMRA weight. Flats, gons and many tanks are 50-75% of the recommended weight. Equipment caused derailments are infrequent. Operator caused derailments are common. In my opinion, the differences are 1) reliable trackwork 2) free rolling wheelsets (all metal in HO), free swinging trucks, proper coupler heights. Again, there are the few equipment caused derailments, but they are not consistent or regular.
2 ozs for a 4in HO I think
3oz
The RP-20.1 NMRA is totally OBSOLETE. Since 1990, a lot as change, cars are build better, but mostly people build there layouts much better, for example, lots of people use much larger radius. Another example is if you're running smaller number of freight cars for delivery. Basically what I'm saying is it depends on your layout and how you run trains. I personally will have weights between 105 grams (empty) and 400 grams (loaded) (3.7 ounces and max of 14.1 ounces).
A lot of factors should determine the weight of your cars. If you are running tight radius, than your cars shouldn't vary to much in weight, same applies if you are pulling lots of cars and especially if there is a mix in weights, for example, 3 light cars , 2 heavy, 2 light, 6 heavy, 3 light, etc.
On half of my fleet, I will be removing a bit of weight for empties and adding a bit of weight to others and the other half, I will be adding weight for full loads.
I've build a WORKING weigh station on my layout and weighing cars will be part of my operations.
The answer is 3 oz and the RP-20.1 should be totally revised.
What would be your full suggestion and idea to replace NMRA RP-20.1? Have you thought about writing a white paper to cover your ideas and suggestions. How would it be done etc. Thanks for your input and looking forward to see your fully fleshed out idea.
Sorry Eric, but I really can't make any suggestions for everybody, it all depends on the layout. My minimum radius is 30" and my operations are based on 14 industries from 2 yards, so the speed of the loco's are not fast and my empties are usually in the back of the haul.
If you add to that super elevation and perfectly flush joints, it also makes it easier for different weights and heavier cars.
I would say the majority of the modelers have small layouts, very tight curves and run their trains how ever they want, so for them NMRA specs should be OK.
I would suggest that people try out the specs and then test it out and adjust to what is best for them. The RP-20.1 is ONLY a guide/suggestion to get you started.
facebook.com/MHOJunction/
4 1/2 OZ apx scale 28 ft HO Box Car (edited = wrong)
Ooops
Holy crap.
4 oz
Now I need to check my self as this was a way old video :)
3 ozs
3 :)
ya. that might be.But and that's a big butt.if i'm going to pay big buck's, i want what i buy to be right.But that's just me!
Mitch Rozelle you still needed to look at the key part of the document too. RP is Recommended Practices. It is not a hard fast rule. It is what the NMRA recommends.