Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [transportation]

The tag has no usage guidance.

1
vote
0answers
46 views

Is there a particular reason the Moléson funicular is built as a giant bridge?

So I live in Switzerland and there is lots of funiculars in my country. Most of those were built between 1890 and 1930, and for most of those the line is on the ground most of the time, there is ...
0
votes
2answers
90 views

What determines the maximum possible slope of rail transportation (without rack)?

(Disclaimer: To make things clear I'm talking about adhesion railways and excluding rack railways as those are an entirely different technology and requires specially equipped vehicles. Also I'm ...
1
vote
0answers
36 views

Does the Hyperloop One suspension require constant current through copper windings?

As a follow-up to How does the pressurized suspension of the Hyperloop not affect the tube pressure?, I believe (though I can't find where I read it now) that the Virgin Hyperloop One implementation ...
1
vote
0answers
19 views

Purpose of special railway transport wagons? [closed]

What's the purpose of the special railway transport wagons shown in the photograph?
5
votes
6answers
131 views

Why don't public transport networks have more routes to each terminal?

When using public transport, we often need to change routes in the middle of the journey. These changes have costs – I can think of the following, but there may be more. If we're reading, working, ...
2
votes
2answers
82 views

Advantages of a commuter train instead of a vehicle travelling in a straight road

Most large cities these days have some sort of metropolitan commuter train system. What are the reasons for the commuter trains, why couldn't we instead of having train tracks why not clear a large ...
0
votes
1answer
41 views

Standard bicycle monorail design considerations

I have been thinking of a design for a standard bicycle monorail. I don't have the resources to prototype it right now so I would like to bounce the design off the community. Basically thinking of a ...
2
votes
1answer
87 views

Why did Jersey barrier bridge rails become the dominant type of highway bridge rail?

Although it's different in each state, most highway bridge rails used to contain either poles or elevated concrete slabs. Very few were just solid concrete. Then, in the mid to late 1970s (some places ...
3
votes
2answers
191 views

Why do trains not have a high-friction emergency braking system?

Looking at the capacity of train networks, systems like CBTC help increase capacity, but the spacing of trains is ultimately limited by poor braking performance. In my understanding, safe distances ...
2
votes
1answer
94 views

What should a road's traffic volume to justify the number of lanes?

Is there a standard that transportation engineers use for the number of vehicles a road should carry daily for it to be widened to four, six, eight lanes, etc? Curious because I've noticed that some ...
5
votes
1answer
169 views

Monorails - why even have them?

My (highly limited) engineering intuition says: Dual railing is good - for balance, for switching of tracks, for lightening load and making sure it is applied in basically the same direction always, ...
0
votes
0answers
54 views

Packing efficiency geometry

Suppose that I am evaluating the packing efficiency of different geometric shapes. Are spheres good shapes to achieve a good packing efficiency / density in a typical shipping box? Are there other, ...
3
votes
1answer
92 views

Why are rail signals overbuilt compared to road signals?

Here is a photo of a railroad crossing near a road intersection. Traffic, Rail Lights out of Sync at Fruitvale Avenue Crossing The road signals are mounted to slender poles (or even suspended from a ...
1
vote
1answer
67 views

Does the decrease in speed of the train at the curvature changes the properties of Speed Time Curve Of Urban Service

Ok, I wish to plot the speed time curve of the my urban service . The travel includes the curvature ( as shown in image ( just for reference )). The train speed is decreased while it runs along the ...
3
votes
1answer
48 views

Vehicle load factor discrepancies

I am doing research on the impact of vehicles on roadways, specifically garbage trucks. In my research I am finding largely different "answers." For example "Using American Association of State ...
3
votes
2answers
401 views

Why use rectifier / inverter in locomotives?

Image Source Why not just take the AC from the alternator to the motors? Why go AC to DC to AC again?
4
votes
2answers
322 views

For train track, why does the ballast need “good drainage”?

Why does the ballast of train track need good drainage? I read something about preventing "fouling" of the ballast, but don't know what that means or why it would be structurally bad. Could ...
3
votes
4answers
229 views

Are rocket engines practical for commercial aircraft?

What are the prospects of seeing rocket engines become the standard for commercial aircraft? It might be a dumb question; I really don't know all that much about the topic. The reason I ask is that ...
2
votes
1answer
158 views

What's the purpose of a 'burger' lane in a roundabout?

I recently read about a newly proposed 'burger' lane across a roundabout. burger lane plan http://www.gloucestershirelive.co.uk/images/localworld/ugc-images/276271/Article/images/29745204/15574035-...
5
votes
0answers
15k views

Gate width calculation for Passenger car design vehicle

I am trying to figure out the minimum gate width required for parking a car inside the house which has a 15 feet road in front of it. Please refer to the image below: Plot is 20 feet wide. I have ...
1
vote
2answers
98 views

Historically, how did tram switches work?

Historically, the switches on regular railways were switched manually using a lever by dedicated staff to route trains correctly before getting replaced by an automatic electronic system. A similar ...
3
votes
1answer
2k views

Which vibration standard is the most common for transported packages?

There are several standards which all are valid when it comes to mechanical shock, bump and vibration, both for products in use and packaged and being transported. Here are a few: ISO 13355:2001 - ...
3
votes
2answers
190 views

How to notate the position of a train?

How is the position of a train modeled in a computer control system? I can think of two basic approaches but I am not sure which (if any) are used in the real world. Lat, Long Ex: (-42, 23) The ...
3
votes
1answer
32 views

Positioning system for skips

We need to position skips to within a few (~10?) cm on level ground. I've seen positioning systems for roll on/off containers, these were horizontal guide rails on the ground and presumably the ...
-1
votes
1answer
69 views

Are tires of a soprts car small in size for low ground clearance? [closed]

since the ground clearance of a sports car is low. Do we use small tires for them?
7
votes
1answer
6k views

How do train tracks handle really cold weather?

First of all, I'm interested in train track only, not the rolling stock. How are tracks built to cope with really cold weather? An example might be some place in Canada or Siberia. Ice would ...
6
votes
3answers
2k views

Why are flyovers/metro rail tracks much higher than traffic?

To pick a specific example, a flyover that goes over a ground-level road/rail need only be as tall so that the tallest vehicle travelling in the outermost lane can clear it. Or another, an elevated ...
5
votes
1answer
1k views

How does the pressurized suspension of the Hyperloop not affect the tube pressure?

So one of the proposed suspension systems that will be used on the hyperloop include the externally pressurized air cushions. These cushions lift (or at least help lift) the capsule and reduce drag ...
6
votes
2answers
1k views

Why does public transport uses compressed air to open doors instead of electromotors?

System with compressed air seems more expensive and harder to build and integrate neither using simple electromagnetic drives to open public transport doors.
7
votes
1answer
219 views

What is required to implement Positive Train Control on railroads in the US?

Background On May 12, 2015, an Amtrak train derailed in Philadelphia, PA, killing 8 and injuring 200 people. I saw a story on the incident where multiple NTSB spokespeople have said at this and other ...
16
votes
1answer
2k views

How many train passes can railway tracks endure?

I know that the rubber on car and truck tires wear, and the road concrete wears out. I wondered: While steel is hard and elastic, it still causes friction (interaction between molecules) and ...
4
votes
1answer
272 views

Which component of vehicle tailpipe emissions has the greatest social cost?

Emissions Emissions from vehicles have an associated social cost for everyone. We hear a lot about CO2, but CO2 is not the only thing that comes out of a tailpipe. From Wikipedia, emissions ...
4
votes
1answer
1k views

How are maximum speed limits determined for banked curves?

I was once told that the speed limits on banked highway curves (specifically off-ramps) were determined by assuming zero friction between the car and the road, such that as long as you stayed on the ...
7
votes
2answers
287 views

Could magnetic levitation transportation systems become a commonplace technology?

Magnetic levitation systems of transportation such as trains seem to be commonplace in early 2000's science fiction, and while some systems exist currently, they aren't exactly common. It seems to me ...