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Bulkhead Flat

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How much weight can a new train engine pull?

I was just wondering how much weight an engine can pull before they have to add another engine to the train. If you know could you also tell me how many cars also.

Alexandria is certainly on the right track (no pun intended). New or old doesn't really play into the equation as does the horse power and weight of the locomotive, and the number of driving axles.

On level terrain, one could handle a given amount of tonnage at a load of maybe 3/4 horse power per trailing ton, but lets simplify the math, and allow for a minimum of one HP per ton, which is actually a reasonable HP to ton ratio. You wouldn't make much speed, but you could start and keep the tonnage moving. Assuming we are speaking of a single 6000 HP locomotive, it would theoretically pull 6000 tons.

Ascending grade of course requires a higher HP to ton ratio. There is a nifty little formula for calculating at what speed a given tonnage will climb a grade, which is called the "rolling train resistence formula". It is quite simple. Determine the horse power per ton ( HPT ), multiply by 12, then divide by the percentage of the grade ( %G ), and this will result in the speed at which the tonnage can ascend. Expressed in other fashion, HPT x 12 / %G = S.

Some locomotives have a "short time rating". The harder the locomotive must work, the higher the ampereage to keep the wheels turning. Again, with the typical DC locomotive, when you get down around 12 to 13 MPH at full throttle, you are well into the short time rating, meaning without a change in speed you are probably looking at about ten minutes before the locomotive will start burning up the traction motors. When this time is reached, the train must stop to allow the traction motors to cool before resuming movement. Using the above formula, if your calculations determine the speed wil be this slow, then that tells you you must add more power to avoid getting in to short time.

As far as a number of cars, this is not useful information, at least where POWER is concerned, because the tonnage is the determinig factor. The number of the freight cars, or more correctly the length of the freight cars, is quite important when determining the braking calculations, but this is another question, so ask and I will try to answer. Freight cars can run anywhere from 35 tons or so for an empty, smaller car, up 145 tons or so for a typical bulkhead flat loaded with milled lumber. With special duty cars, the tonnage of a single car can be much more.

Hope this clarifies it for you. While on the subject of locomotives running around with all this tonnage, please keep yourself out of the way. Only you can put yourself in danger. If I can see you, it is already too late to stop for you...........

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Vintage N Scale Aurora Penn Central Bulkhead Flat Car
Vintage N Scale Aurora Penn Central Bulkhead Flat Car
$17.00
Vintage N Scale Aurora Canadian National Bulkhead Flat Car
Vintage N Scale Aurora Canadian National Bulkhead Flat Car
$17.00
Aurora Rail Master N Scale Penn Central Bulkhead Flat Car 55601
Aurora Rail Master N Scale Penn Central Bulkhead Flat Car 55601
$4.06
Oddballs decals N Gauge Chicago Great Western bulkhead flat car ptd black H52
Oddballs decals N Gauge Chicago Great Western bulkhead flat car ptd black H52
$7.25
N SCALE UNDECORATED BULKHEAD FLAT BY ATLAS METAL WHEELS BLACK IN COLOR
N SCALE UNDECORATED BULKHEAD FLAT BY ATLAS METAL WHEELS BLACK IN COLOR
$10.00
N SCALE BULKHEAD FLAT  3065 BY ATLAS GREAT NORTHERN 65414 BRIGHT RED
N SCALE BULKHEAD FLAT 3065 BY ATLAS GREAT NORTHERN 65414 BRIGHT RED
$14.00
Micro Trains 53040 Trailer Train 60 8 Centerbeam Bulkhead Flat Car TCAX 700006
Micro Trains 53040 Trailer Train 60 8 Centerbeam Bulkhead Flat Car TCAX 700006
$24.99
N Athearn 10872 53 Bulkhead Flat BN Burlington Northern 616049
N Athearn 10872 53 Bulkhead Flat BN Burlington Northern 616049
$24.95
N Athearn 10871 53 Bulkhead Flat BN Burlington Northern 616036
N Athearn 10871 53 Bulkhead Flat BN Burlington Northern 616036
$24.95
N SOO LINE GSC bulkhead flat cars with custom made log loads X2
N SOO LINE GSC bulkhead flat cars with custom made log loads X2
$20.00
MT 54040 Trailer Train 61 Bulkhead Flat Car Released November 1995
MT 54040 Trailer Train 61 Bulkhead Flat Car Released November 1995
$17.75
MT 54070 CP Rail 61 Bulkhead Flat Car Released May 1988
MT 54070 CP Rail 61 Bulkhead Flat Car Released May 1988
$22.85
N MTL 54100 61 8 bulkhead flat MDW Minnesota Dakota  Western NIB 2003
N MTL 54100 61 8 bulkhead flat MDW Minnesota Dakota Western NIB 2003
$0.99
N Scale MTL 54040 TrailerTrain Bulkhead Flat R 80280
N Scale MTL 54040 TrailerTrain Bulkhead Flat R 80280
$5.99
N Scale Con Cor 0001 1221 Chessie System 60 Bulkhead Flat 9349 P002
N Scale Con Cor 0001 1221 Chessie System 60 Bulkhead Flat 9349 P002
$16.99
Micro Trains MTL N Scale Bulkhead Flat Cars Union Pacific UP Turbines 4 Pack
Micro Trains MTL N Scale Bulkhead Flat Cars Union Pacific UP Turbines 4 Pack
$119.99
Con Cor 60 Bulkhead Flat trailer Train
Con Cor 60 Bulkhead Flat trailer Train
$7.50
MTL Micro Trains 05454009 61 8 Bulkhead Flat Car w Load WEATHERED BNSF 545711
MTL Micro Trains 05454009 61 8 Bulkhead Flat Car w Load WEATHERED BNSF 545711
$34.95
Micro Trains N Scale 618 Bulkhead Flat Car 54040
Micro Trains N Scale 618 Bulkhead Flat Car 54040
$6.50
LUMBER LOADS 2x4s FOR 50 60 FLAT CENTERBEAM BULKHEAD CARS N SCALE FNL 1002
LUMBER LOADS 2x4s FOR 50 60 FLAT CENTERBEAM BULKHEAD CARS N SCALE FNL 1002
$5.95
LUMBER LOADS 4x8 FOR 50 60 FLAT CENTERBEAM BULKHEAD CARS N SCALE FNL 1004
LUMBER LOADS 4x8 FOR 50 60 FLAT CENTERBEAM BULKHEAD CARS N SCALE FNL 1004
$5.95
MT 054 52 155 Union Pacific 61 Bulkhead Flat Car with Wind Turbine Generator
MT 054 52 155 Union Pacific 61 Bulkhead Flat Car with Wind Turbine Generator
$33.80
MT 054 44 180 Factory Weathered Great Northern 61 Bulkhead Flat Car with Load
MT 054 44 180 Factory Weathered Great Northern 61 Bulkhead Flat Car with Load
$24.75
N SCALE MICRO TRAINS 54100 BULKHEAD FLAT CAR MDW 1123 WITH LOADD
N SCALE MICRO TRAINS 54100 BULKHEAD FLAT CAR MDW 1123 WITH LOADD
$35.00
N SCALE MICRO TRAINS 78595 BULKHEAD FLAT CAR ACL WITH LOAD
N SCALE MICRO TRAINS 78595 BULKHEAD FLAT CAR ACL WITH LOAD
$25.00
NOS Con Cor N Scale 60 Bulkhead Flat with Centerbeam Centex Train Car
NOS Con Cor N Scale 60 Bulkhead Flat with Centerbeam Centex Train Car
$17.99
Con Cor 60 Bulkhead Flat w Centerbeam Centex 1491 w MTL trucks
Con Cor 60 Bulkhead Flat w Centerbeam Centex 1491 w MTL trucks
$11.06
NOS Con Cor N Scale 60 Bulkhead Flat with Centerbeam Milwaukee Road Train Car
NOS Con Cor N Scale 60 Bulkhead Flat with Centerbeam Milwaukee Road Train Car
$17.99
NOS Con Cor N Scale 60 Chessie System Bulkhead Flat with Centerbeam Train Car
NOS Con Cor N Scale 60 Chessie System Bulkhead Flat with Centerbeam Train Car
$17.99
N Scale Micro Trains Line 53030 U Pacific 60 8 Centerbeam Bulkhead Flat Car
N Scale Micro Trains Line 53030 U Pacific 60 8 Centerbeam Bulkhead Flat Car
$12.95
Athearn  24191 53 GSC Bulkhead Flat SOO  5955 N MIB
Athearn 24191 53 GSC Bulkhead Flat SOO 5955 N MIB
$22.98
Athearn  10896 53 GSC Bulkhead Flat BN  616039 N MIB
Athearn 10896 53 GSC Bulkhead Flat BN 616039 N MIB
$22.98
Athearn  24194 53 GSC Bulkhead Flat TTX  475290 N Scale MIB
Athearn 24194 53 GSC Bulkhead Flat TTX 475290 N Scale MIB
$22.98
N Scale Athearn 24186 53 GSC Bulkhead Flat GN 160043
N Scale Athearn 24186 53 GSC Bulkhead Flat GN 160043
$17.90
Micro Trains N Scale 054 00 201 SOO Line 61 Bulkhead Flat Car Rd 5066 NIB
Micro Trains N Scale 054 00 201 SOO Line 61 Bulkhead Flat Car Rd 5066 NIB
$27.90
N Scale Micro Trains Centex 60ft 8in Centerbeam Bulkhead Flat Car OB
N Scale Micro Trains Centex 60ft 8in Centerbeam Bulkhead Flat Car OB
$23.99
N Scale MICRO TRAINS 54070 CANADIAN PACIFIC 61 8 Bulkhead Flat Car CP
N Scale MICRO TRAINS 54070 CANADIAN PACIFIC 61 8 Bulkhead Flat Car CP
$28.00
N Scale Load for 61 8 Bulkhead Flat Car
N Scale Load for 61 8 Bulkhead Flat Car
$10.00
N Scale Load for 61 8 Bulkhead Flat Car
N Scale Load for 61 8 Bulkhead Flat Car
$10.00
N Scale load for Bulkhead Flat Car
N Scale load for Bulkhead Flat Car
$10.00


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