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Even though the listed speed for planes are 951 km/h and the listed speed for maglev trains are 643 km/h, the trains seems to be moving at a much faster speed. In fact, I have a section of track that ran right by the flight path and the train regularly speeds past the planes. Are planes worth the effort since their so high maintenance and are at risk of crashes?

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The reason why your planes seem to be slower is because planes fly at a quarter of their listed speed, so sub-sonic planes actually fly at around 240km/h, which is significantly less than maglevs. The quarter speed rule can be adjusted in advanced settings. There are a few other interesting game mechanics surrounding the calculation of vehicle speeds. For the specifics, see the OpenTTD wiki article on vehicle speed.

Whether or not planes are 'worth it' is a purely subjective question, but if your sole goal is making money, then in the absence of competitors, with cities of sufficient size to provide the passengers and enough initial capital to set up the airports and buy the planes, air transport is easily the most lucrative business you can run in the game. It's easy to set up, and require little maintenance, and makes oodles of money compared to the amount you spend maintaining the aircraft. In fact, some players like to set air routes early in the game to make enough money such that they can concentrate on playing with trains later on without worrying about running out of money.

Regarding the risk of crashes, there is one specific case you want to avoid to reduce the likelihood of crashes - large planes landing at small or commuter airports have significantly increased risk of crashing (from 0.07% to 5%), so try to upgrade your airports as soon as you can. A list of 'small' planes that can safely land on small airports can be found on the wiki.

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I haven't looked at the code myself, but I believe the km/h speeds have no direct relationship to the squares on the board and how fast the vehicles move -- they are color text. Clearly the differential between a 100 km/h train and 600 km/h is not 6x.

Imho, planes are not worth it -- openttd for me is all about the trains and maybe some road vehicles to move passengers from the inner city to bimodal stations lying a bit further away. But YMMV. I also turn off all maintenance/breakdown options and never use the AI; I'm a pure sandbox player.

Now you made me want to play it again. Here's the link to the site for anyone who is wondering what we're talking about:OpenTTD

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I see, so the 'speed' factor is only used when calculating profit but doesn't really represent how fast the vehicle is moving? –  z ' Mar 19 '12 at 20:17
    
"Now you made me want to play it again." - Story of my life with this awesome game. –  YellowMegaMan Mar 19 '12 at 22:57
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"the km/h speeds have no direct relationship to the squares on the board and how fast the vehicles move" this is not true - see my answer and the wiki article linked. Aircraft represent a special case, but in general the numbers you see do represent the speed of the vehicles –  Private Pansy Mar 21 '12 at 10:30
    
Very interesting, thanks for the link. –  ohmi Mar 24 '12 at 4:33
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