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Post by packrat1701 on Aug 24, 2013 15:31:56 GMT -5
This is the newest addition to the collection. It is an ex Southern Pacific SD45T-2 Tunnel Motor with the TP&W decals added. The locomotive is an Athearn RTR model.
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Post by tamaman on Sept 4, 2013 9:14:43 GMT -5
Nice lookin unit!
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Post by Canadian Atlantic Railway on Sept 20, 2013 20:45:49 GMT -5
Nice With the price of diesel and cheapness of buying SD40-2's I wonder how much longer the beasts will work for the G&W?
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Post by railfansd40t2 on Apr 15, 2014 18:14:37 GMT -5
Nice With the price of diesel and cheapness of buying SD40-2's I wonder how much longer the beasts will work for the G&W? Two of my favorite locomotives but had no idea the 45's got low fuel mileage and the 40's don't. The things I learn on this site. Paulie
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Post by m a y o r 79 on Apr 16, 2014 12:48:00 GMT -5
Looks good, way to clean though
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Post by PVRR 2647 on Sept 6, 2014 22:42:39 GMT -5
Nice With the price of diesel and cheapness of buying SD40-2's I wonder how much longer the beasts will work for the G&W? Two of my favorite locomotives but had no idea the 45's got low fuel mileage and the 40's don't. The things I learn on this site. Paulie I never really understood why CMOs thought that a 20 cylinder engine should have the same fuel economy as a 16 cylinder engine?
PVRR2647
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Post by railfansd40t2 on Sept 7, 2014 10:19:06 GMT -5
Well that answers the differences in the fuel mileage for me. I did not know one was a V-8 and the other a 4 Popper Paulie
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Post by PVRR 2647 on Sept 7, 2014 16:52:14 GMT -5
I wonder if the extra 600hp was worth the added fuel expense over the life of the locomotive? Both the 40s and 45s have the same continuous tractive effort and the 40s have better starting T.E. than the 45s. As they say: Horsepower makes the sale, but Tractive Effort pulls the train!
PVRR2647
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spike
Chairman
They say I can't be Spike anymore, so Mr. Burns it is!
Posts: 561
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Post by spike on Sept 8, 2014 11:51:05 GMT -5
The 45 was a more high speed unit than the 40. Santa Fe and EL were famous for putting them on priority piggyback jobs.
I have noticed where a 40 will top out on horsepower at about 45 mph, but a 45 still has lots more power to get up to 50-60 mph, under similar circumstances.
Why do you think the steel roads were content with SD38s? Low horsepower, and a low priority commodity. Speed was not an issue. Many roads were content with a medium powered 40 series, like BN, and CP. In truth, CP had the M636, which was intended for priority service. They were just too temperamental to fulfill that role.
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Post by railfansd40t2 on Sept 8, 2014 16:53:44 GMT -5
I also wonder if the 45's were then like the 60's and 70's big blocks meaning the faster steady speed they went the better the fuel mileage. I know my 68 Charger with a Big Block 383 was this way. It got much better mileage at a steady 70 to 80 than it did at 50 to 60. That car did not like 55 at all. Now in comparison my 72 Charger with a 318 in it did better on fuel at 60 to 70 but beyond or below that it would loose a bit.
Paulie
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Post by PVRR 2647 on Sept 8, 2014 20:41:14 GMT -5
I'm not trying to argue with anyone here but... The maximum continuous T.E. is generated at only 11mp , so the faster it goes the less T.E. it produces. Both the 45-2s and the 40-2s have the same top speed of 65mph with 62:15 gearing. I know that Uncle Pete had some "Fast Forties" geared at 59:18 so that they could operate with the Centennials. From my limited understanding the only thing that a larger engine will contribute to the equation is the ability to reach top speed faster that a smaller engine. But with greater fuel consumption than the smaller engine. Like I said earlier I'm not trying to argue with anyone. If I am missing some important point please share it, I want to expand what little knowledge I have in regards to prototype locomotives.
PVRR2647
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Post by oldrail on Sept 9, 2014 2:30:51 GMT -5
IIRC (can't find my Railway Fuel Officers book right now) the SD40 burns aprox 172 gal/per/hr, the SD45 is about 188gph.
Based on real life experience the SD45 is better at thru freight (50-60 mph), the SD40 wins hands down dragging coal.
Dick Haave
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Post by railfansd40t2 on Sept 9, 2014 5:31:36 GMT -5
Hey pvrr2647, I don't think anyone feels like you are arguing at all this to me has been a good conversation and I know I am learning for sure because I know the units I like but don't always know all the particulars like what we are discussing here about two of many of my favorites.
Paulie
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Post by PVRR 2647 on Sept 9, 2014 19:18:21 GMT -5
Paulie~ This forum is probably one of the greatest resources available to model railroaders today. Before I joined this group I hadn't seriously worked on my railroad in a year. But the collective knowledge and skill that this forum exudes has inspired me to take on new projects that I would have never attempted before. I want to make sure that I am always polite and respectful to everyone here. "We few, we happy few, we band of brothers. For he today that sheds his blood with me, Shall be my brother" -Shakespeare; King Henry the 5th
PVRR2647
I felt that the Shakespeare quote was necessary while I was on my soapbox :-)
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Post by PVRR 2647 on Sept 9, 2014 19:40:12 GMT -5
IIRC (can't find my Railway Fuel Officers book right now) the SD40 burns aprox 172 gal/per/hr, the SD45 is about 188gph.
Based on real life experience the SD45 is better at thru freight (50-60 mph), the SD40 wins hands down dragging coal.
Dick Haave
Dick~ The figure that I found for the 16-645E3 is 164.4 gph @ 3000hp, I can't find a figure for the 20-645E3 but judging by your memory I'd say that you're pretty close, if not right on the money. My question is what makes one better than the other for certain types of services? Does the 45 accelerate faster than the 40 can and thus make it easier to maintain track speeds on fast freights?
Regards, PVRR2647
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Post by railfansd40t2 on Sept 9, 2014 20:11:09 GMT -5
Well I couldn't agree with you more because I know that the only reason I rebuilt the Bachmann Centennial into a better model was because of this site. Sure I could have saved for months to buy the Athearn one but that is a an awful lot of money for a unit that will just sit in a case since I don't run my stuff. I kept looking at things on here and some of the cool saves and rebuilds that have been posted and thought I would give it a go and I am glad I did. No... it is not perfect and there are some things I could have done a bit better but that locomotive is much more prototypical now and doesn't look like a toy anymore. I had thought about tearing it down several times many years ago but kept putting it away thinking I would screw it up but again I was reading about things the guys do here and it gave me the push I needed to take it back out of the box and get it done. Now it is displyed in the train cabinet and not in a box I made for it stored in a large plastic tote under the bed. I am now slowly collecting some detail parts for the RPP SD90MAc which will truthfully be an SD9043 when finished to try and take that build up a notch. It wont be super detailed because I struggle with the small parts but it will have some things added just because of what I have seen done here. Also I did not know nearly what I know now about this unit untill I bought it aand started asking questions to which a lot of the guys responded to and helped me with getting the correct after market parts for it. It is nice to have people I feel comfortable with asking questions to without the fear of feeling like a dumb ass or having someone talk down to you because they know there are 8 doors between this area and that area and not 9. Perfect example is this post, You could have put a gun to my head and asked me how many cylinders are in an SD45T-2 and I would be dead BUT, I can tell you there are 3 access doors under the rear radiators on the 45's and only two on the SD40T-2's. Plus I do believe there were never any Snoots or the long front porches on the 45's but I could be wrong. I have loved these two units since I was a kid but these are the things I am learning thanks to discussions like we have had about both of them in this post. I don't have any good quotes except ones from movies or cartoons but at this moment I dont have one that fits . Paulie
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Post by PVRR 2647 on Sept 9, 2014 20:40:31 GMT -5
Paulie~ You do very nice work I have seen your Centennial rebuild and I think it came out great! If I had built it I certainly would have it on display too. I wouldn't ever put anyone on the spot in this forum, it's just not the atmosphere here and isn't appropriate. Remember the only "dumb" question is the one not asked. Remember: "Einstein did his best stuff when he was working as a patent clerk"-Pete Venkman; Ghostbusters
PVRR2647
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Post by railfansd40t2 on Sept 10, 2014 6:20:47 GMT -5
Thank you for the kind words it is certainly appreciated.
Paulie
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spike
Chairman
They say I can't be Spike anymore, so Mr. Burns it is!
Posts: 561
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Post by spike on Dec 14, 2016 12:00:49 GMT -5
My point is that the higher horsepower allows the unit to accelerate faster, and can also maintain higher speeds on hills. If you had 3 exact trains. The first one had a SD38, second SD40, third SD45. The 38 might max out at 30 mph. Its speed would fall off quicker when a hill was reached.
The 40 might max out at 40 mph, with the same train. It would pull the hill at a higher speed too. Of course the 45 would top out even higher, and pull the same hill even faster yet.
There are two methods of assigning power. A bulk train might get power assigned with maximum continuous TE in mind. There may be no priority, so a set of SD38s can pull along at 30 mph, and nobody minds.
A priority train might get its power assigned so there is 3 hp/t. In this case, it would be adventurous to put 3 SD45s, instead of 4-5 SD38s. It would take less units to maintain the high speed, and this being a light pig train, TE is less of a concern.
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Post by PVRR 2647 on Dec 15, 2016 20:12:26 GMT -5
Spike~
Now I understand the point of higher horsepower when you factor in the hp per ton ratio for a given train. It takes less units per train with more hp to move a train of given size at a certain speed. So therefore a train of x tonnage might take 4 sd9s to power it over the ruling grade at y speed. The same train will only require 2 sd40s to power it over the same grade at the same speed. Know wonder the SD40-2 and the ES44ac are so popular.
Thank You, PVRR2647
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