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The manual states (page 52):

As long as the unit moves from one tile containing a road/railroad into another tile containing a road/railroad, the unit will expend just a fraction of the normal cost to move.

It doesn't say, however, what are the exact values of the fractions. Does moving along a road takes the underlying terrain into account? Is there any place these numbers are written?

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1 Answer

up vote 15 down vote accepted

I did a quick test using a couple different saves I had available to me, and found the following:

Route                   |  Cost (Movement points)
Road                    |   1/2
Road, with Machinery    |   1/3
Railroad for fast unit  |   1/3
Railroad for slow unit  |  3/10

More info

  • Each unit lists how many movement points it has remaining in the bottom left when it is selected. The movement points are normally shown as rounded whole numbers only, but you can see the decimal number if you mouse over it.
  • What terrain a road/railroad is on makes no difference. Roads on open terrain, hills, and forest all cost the same to move across.
  • I tested both slow (2 movement point) and fast (4 movement point) units on each type f route. Railroad was the only one that showed a difference for different units.
  • 3/10 (0.3) is an odd number, but its actually what I found.
  • Going from road to rail or rail to road costs the slower 1/3.
  • Remember roads do not bridge rivers until you get construction.

Edit: In my first test, I had an extra movement point on my units due to playing as Persia in a golden age. (I did not remember where it came from, thanks bwarner) I've tested again and got the same results.

Edit2: I incorrectly listed the tech that increase road movement speed as Construction. Construction is important here because it builds bridges, but the one that affects the speed of roads is Machinery.

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I would guess your bonus movement came from being Persia during a golden age? –  bwarner Oct 1 '10 at 17:14
    
@bwarner Why yes, Persia was the save I loaded, and I did have a golden age going. Is 70 turns of Golden Age too long? :) With that mystery solved, I'll clean up the answer. –  WillfulWizard Oct 1 '10 at 17:18
    
⅓? (15 characters) –  Hello71 Oct 1 '10 at 21:17
    
@Hello71 What exactly do you mean? 1/3 is indeed what units use on roads with machinery and fast units use on railroads. I could have used fractions but because of either .3333 or 3/10, its going look weird in either decimal or fractions. I'm quite curious how they arrived at 3/10. –  WillfulWizard Oct 2 '10 at 2:19
    
So basically Railroads are no better for movement than a normal road (since you have to have Construction at that point)? –  bwarner Oct 6 '10 at 17:11
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