Why do railroads use timber ties on bridges and concrete ones on the ground?

Let’s learn why do railroads use timber ties on bridges and concrete ones on the ground. The most accurate or helpful solution is served by Yahoo! Answers.

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Why do railroads use timber ties on bridges and concrete ones on the ground?

just had to walk the tracks in the Wendover Canyon in eastern Wyoming and noticed the difference in the ties. I'm curious. I know timber absorbs shocks and vibration better than ...show more

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Amtrak uses concrete on the Northeast Corridor. They converted open deck bridges to ballasted deck bridges...

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What is the relationship between 911 and Saddam?

By The Numbers On September 11th, 2001 4 Flights were hijacked. American Airlines Flight 11 which left Boston's Logan Airport bound for Los Angeles before being piloted into the North Tower of the World Trade Center.American Airlines Flight 77 which...

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I think Hillery Clinton summarized Saddam's relationship with 9/11 best .. In the four years since the...

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To Ground, or not to Ground?

have a new job at a company that installs POS systems(all windows based PC, really there is a sever and several nodes, just a network) in restaurants. Restaurants need to run cheaply to be profitable. The owners often cut corners. The manufacturer suggests...

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I don't see how you need isolated lines. I've some experience in grounds for large instrumentation systems...

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What is the procedure for bridges?

I'm 29 and have a couple of congenitally missing teeth (upper incisors - 7 and 10). I'm on year 2 of Invisalign per my ortho. The teeth behind where the upper incisors should be grew partially into that spot and there was a gap. I also had a gap in between...

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http://travelandsmile.files.wordpress.co… There is a pic of a bridge and what the dentist does...

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Confusion about neutral to ground short

QUESTION: I have a receptacle that has a dedicated 20 amp breaker. Plugging a tester in it, it's telling me I have a neutral to ground short. Although I believe I understand the benefit and necessity to having separate wires for the purpose on appliance...

Answer:

Mick, Thats an interesting little tester. I'm almost tempted to buy the darn thing. Ok here's how I...

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Bug questions! Centipedes, ground beetles, ladybugs and tent caterpillars?

I'm 18 and over the past couple weeks I've gotten into a "bug" phase. It started after I got a baby tarantula for a pet, and that same night I caught a wolf spider in my basement that I kept. They are both doing very well and I've decided to...

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Ah, a fellow bug lover. Awesome. I like to examine all kinds of bugs (and have owned 20 different species...

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Answer:

Croatia uses many forms of transportation, including trains, automobiles and ferries. Buses are also...

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Are Ground Power Units still in use?

are ground power units (GPUs) for the B747 still in use? If they are, are there portable ones and stationary ones? i would appreciate a few links here and there cuz i am doing a school project.. =)

Answer:

GPUs are still being used be it on Boeing Aircrafts and other A/crafts They are portable, but bulky...

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Will turf studs work in my rugby boots on hard ground?

I am a rather new Rugger and have limited experience buying boots. I found some boots I really liked on Amazon. When I got them I started playing a bit of rugby with my friends behind my house (on soft ground) and the boots were amazing. On the first...

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Serious players will often keep several pairs of boots in their kit, and then select the pair for the...

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Ground manners! help? (20 characters)?

Ok i need some major help here. Please no rude answers im honestly here for advice. Over the past couple months, my horse's ground manners have been atrocious. He has always been sensitive as he is a ottb. He hates being groomed and is always nipping...

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OTTB's often have this issue; they are made claustrophobic from their starting gate training, and it...

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