DD40X

[wcaudle]

These bad boys used to rumble past my house as the were entering and leaving the Hinkle yard in Eastern Oregon. They would hit a certain speed and the house would shake. BUT!!! what an awesome sight they were, especially running through the Blue Mountains. There would be 2 on the front and possibly 1 in the middle, with 3 or 4 SD40-2's on the rear. Uncle Pete has always had the thirst for big trains and heavy HP>

[mudchicken]

About 18 feet shorter, two fewer axles and 58 tons lighter.

Mudchicken

[mudchicken]

About 18 feet shorter, two fewer axles and 58 tons lighter.

Mudchicken

[Anonymous]

How smaller are SD90Macs compared to DD40-s?

[Anonymous]

How smaller are SD90Macs compared to DD40-s?

[Anonymous]

You would think Union Pacific had learned from the Big Boy failure, "Bigger is not better". I am surprised the SD90mac's are not seeing some of these problems.
TIM A

[Anonymous]

You would think Union Pacific had learned from the Big Boy failure, "Bigger is not better". I am surprised the SD90mac's are not seeing some of these problems.
TIM A

[Anonymous]

QUOTE: Originally posted by vsmith

There is a DD40 on display at the L.A. County Fairgrounds in Pomona, Ca.,

That's where that picture was taken.

[Anonymous]

QUOTE: Originally posted by vsmith

There is a DD40 on display at the L.A. County Fairgrounds in Pomona, Ca.,

That's where that picture was taken.

[vsmith]

There is a DD40 on display at the L.A. County Fairgrounds in Pomona, Ca., along with 4-8-8-4 Big Boy, a UP 4-12-2 (I think its a 4-12-2), a SF 4-6-2, and a ex-colorado 2-8-0 three-footer along with the ex-City of Arcadia passenger station that the termites somehow missed. Maybe some other stuff, havent been there for a while.

[vsmith]

There is a DD40 on display at the L.A. County Fairgrounds in Pomona, Ca., along with 4-8-8-4 Big Boy, a UP 4-12-2 (I think its a 4-12-2), a SF 4-6-2, and a ex-colorado 2-8-0 three-footer along with the ex-City of Arcadia passenger station that the termites somehow missed. Maybe some other stuff, havent been there for a while.

[Anonymous]

Come on Mook , your brain is disengaged again. YOU JUST FLUNKED YOUR QUIZ . YOU'RE GROUNDED FOR 24HRS.. LMAO

[Anonymous]

Come on Mook , your brain is disengaged again. YOU JUST FLUNKED YOUR QUIZ . YOU'RE GROUNDED FOR 24HRS.. LMAO

[Mookie]

QUOTE: Originally posted by mudchicken

Reading Coal:

Tree68 is right, the steam engines bad blind drivers and the inside diesel axles on the D truck do not. There is only so much lateral motion allowed on the D-Truck with an axle. It's the length of the truck as opposed to the length of the unit that is an issue here. (DD40AX's had a huge coupler swing)...The yards in San Bdno ("A" yard/depot and "B" yard)were all #8 and #6-1/2 turnouts (9 degree 31 minutes or sharper), suspect that those rascal would not turn well on any curve over 6 degrees.

Hardly an urban myth. Any roadmaster worth his salt would be concerned to see something that big (248 tons)wandering around in the light duty backtracks...the same goes for the bigger steam engines. Amtrak and Santa Fe guys had trouble with new GE dash-8 locos with restricted coupler swing straight out of the factory (not worn and not lubricated)...they tore up a healthy number of 6-1/2 turnouts in yards system wide until they got worn in and lubricated. Usually they "rolled over" the outside curved rail between the switch points and the frog, yanking spikes right out of good ties.....the lateral force on the rail just would get beyond what the spike and tie could be expected to hold.

-mudchicken

Feather Duster - bet this would be really interesting if I had a clue what you just said!

Moo

[Mookie]

QUOTE: Originally posted by mudchicken

Reading Coal:

Tree68 is right, the steam engines bad blind drivers and the inside diesel axles on the D truck do not. There is only so much lateral motion allowed on the D-Truck with an axle. It's the length of the truck as opposed to the length of the unit that is an issue here. (DD40AX's had a huge coupler swing)...The yards in San Bdno ("A" yard/depot and "B" yard)were all #8 and #6-1/2 turnouts (9 degree 31 minutes or sharper), suspect that those rascal would not turn well on any curve over 6 degrees.

Hardly an urban myth. Any roadmaster worth his salt would be concerned to see something that big (248 tons)wandering around in the light duty backtracks...the same goes for the bigger steam engines. Amtrak and Santa Fe guys had trouble with new GE dash-8 locos with restricted coupler swing straight out of the factory (not worn and not lubricated)...they tore up a healthy number of 6-1/2 turnouts in yards system wide until they got worn in and lubricated. Usually they "rolled over" the outside curved rail between the switch points and the frog, yanking spikes right out of good ties.....the lateral force on the rail just would get beyond what the spike and tie could be expected to hold.

-mudchicken

Feather Duster - bet this would be really interesting if I had a clue what you just said!

Moo

[mudchicken]

Reading Coal:

Tree68 is right, the steam engines bad blind drivers and the inside diesel axles on the D truck do not. There is only so much lateral motion allowed on the D-Truck with an axle. It's the length of the truck as opposed to the length of the unit that is an issue here. (DD40AX's had a huge coupler swing)...The yards in San Bdno ("A" yard/depot and "B" yard)were all #8 and #6-1/2 turnouts (9 degree 31 minutes or sharper), suspect that those rascal would not turn well on any curve over 6 degrees.

Hardly an urban myth. Any roadmaster worth his salt would be concerned to see something that big (248 tons)wandering around in the light duty backtracks...the same goes for the bigger steam engines. Amtrak and Santa Fe guys had trouble with new GE dash-8 locos with restricted coupler swing straight out of the factory (not worn and not lubricated)...they tore up a healthy number of 6-1/2 turnouts in yards system wide until they got worn in and lubricated. Usually they "rolled over" the outside curved rail between the switch points and the frog, yanking spikes right out of good ties.....the lateral force on the rail just would get beyond what the spike and tie could be expected to hold.

-mudchicken

[mudchicken]

Reading Coal:

Tree68 is right, the steam engines bad blind drivers and the inside diesel axles on the D truck do not. There is only so much lateral motion allowed on the D-Truck with an axle. It's the length of the truck as opposed to the length of the unit that is an issue here. (DD40AX's had a huge coupler swing)...The yards in San Bdno ("A" yard/depot and "B" yard)were all #8 and #6-1/2 turnouts (9 degree 31 minutes or sharper), suspect that those rascal would not turn well on any curve over 6 degrees.

Hardly an urban myth. Any roadmaster worth his salt would be concerned to see something that big (248 tons)wandering around in the light duty backtracks...the same goes for the bigger steam engines. Amtrak and Santa Fe guys had trouble with new GE dash-8 locos with restricted coupler swing straight out of the factory (not worn and not lubricated)...they tore up a healthy number of 6-1/2 turnouts in yards system wide until they got worn in and lubricated. Usually they "rolled over" the outside curved rail between the switch points and the frog, yanking spikes right out of good ties.....the lateral force on the rail just would get beyond what the spike and tie could be expected to hold.

-mudchicken

[tree68]

Many of the long-wheelbase steam locos had "blind drivers" - drivers with no flanges, specifically for that reason.

[tree68]

Many of the long-wheelbase steam locos had "blind drivers" - drivers with no flanges, specifically for that reason.

[Anonymous]

I was told that by an old timer that I worked with who came to Roseville from a yard in L.A.

[Anonymous]

I was told that by an old timer that I worked with who came to Roseville from a yard in L.A.

[Anonymous]

Why would there be so much trouble with the 4 axle trucks? The rigid wheelbase is comparable to a small 0-6-0 which had no trouble with any switches outside of trolley tracks. If the Santa Fe had trouble with the DD trucks how did they ever manage with the eight coupled wheelbase of the 4-8-4's, or worse yet the 2-10-2's I think that this issue is one of those "urban myths".

[Anonymous]

Why would there be so much trouble with the 4 axle trucks? The rigid wheelbase is comparable to a small 0-6-0 which had no trouble with any switches outside of trolley tracks. If the Santa Fe had trouble with the DD trucks how did they ever manage with the eight coupled wheelbase of the 4-8-4's, or worse yet the 2-10-2's I think that this issue is one of those "urban myths".

[Anonymous]

I know someone out there does! You just have to wait for some time.

[Anonymous]

I know someone out there does! You just have to wait for some time.

[Anonymous]

I honestly don't know Alex

[Anonymous]

I honestly don't know Alex

[Anonymous]

QUOTE: Originally posted by drailed1999

The DD40AX was also known as the 6600HP track straightener. The Santa Fe banned them from their San Bernadino yard cause it straightened out all the switches it went thru.

I figured... it's so long. What was the max curve(degrees) it could negotiate?

[Anonymous]

QUOTE: Originally posted by drailed1999

The DD40AX was also known as the 6600HP track straightener. The Santa Fe banned them from their San Bernadino yard cause it straightened out all the switches it went thru.

I figured... it's so long. What was the max curve(degrees) it could negotiate?

[Anonymous]

The DD40AX was also known as the 6600HP track straightener. The Santa Fe banned them from their San Bernadino yard cause it straightened out all the switches it went thru.