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Ways in Simutrans Extendedlink


Also see: Vehicle Physics

Weight limitslink


In Simutrans-Standard, vehicles of any weight can traverse any way without penalty. In Simutrans-Extended, ways (including roads, railways, bridges and tunnels) all have a weight limit. If a vehicle tries to use a way for which it is too heavy, it will either have to travel at a fraction of its normal speed, and will display a message informing the user that it is too heavy. For ways other than bridges, the weight limit is an axle load limit. All vehicles have an axle load (which is not affected by whether they are full or empty), and all non-bridge ways have axle load limits. Bridges' weight limits are based on the total convoy weight (including any load), divided by the maximum proportion of the convoy that can be on the bridge at any one time.

This feature can be customised in simuconf.tab: weight limits can be disabled entirely (which allows reversion to the behaviour of Simutrans-Standard), enforced in the default way described above, or strictly enforced, preventing any routing over overweight ways at all.

The aim of this feature is to give the player more challenges and interesting decisions in the construction of networks, and also to give the player incentives to use appropriate vehicles for particular tasks (lighter vehicles for more minor routes where it is not profitable to install bridges with high weight limits, for example). Weight limits are an important part of transport infrastructure design, so their implementation makes Simutrans more realistic.

Way constraintslink


In Simutrans-Standard, any vehicle can go on any way of the relevant type, except that electrified vehicles cannot go on unelectrified ways.

In Simutrans-Extended, it is possible to define way constraints so that only certain sorts of vehicles can go on certain ways, or certain sorts of vehicle need a particular type of way. There are two types of way constraints: permissive and prohibitive. A permissive way constraint is one that allows a vehicle with a matching constraint to use it. For example, if a particular vehicle requires 3rd rail electrification to run, then it would have the 3rd rail electrification permissive constraint, and would only be able to run on track with the matching 3rd rail permissive constraint (not on track with, say, overhead electrification). Track with a permissive constraint does not stop vehicles without the matching constraint also using it: a diesel train, for example, can run over electrified lines. A prohibitive way constraint is one that prohibits all vehicles except for those with a matching constraint from using the way. For example, some suburban underground rail networks, such as that in London, use very small ("tube") tunnels into which ordinary trains cannot fit. To simulate this, the tunnel would have the "tube" prohibitive constraint, and would only allow tube trains (trains with the matching "tube" prohibitive constraint) to use them. Vehicles with a prohibitive constraint are not stopped from using ways without a matching constraint. For example, tube trains can also run in larger tunnels, or in the open, on stretches of track shared with full-sized trains.

There are no settings for this in simuconf.tab, but, if no constraints on either ways or vehicles are specified in the paksets, then this feature will not be used.

The aim of this feature is to provide more variety of different subtypes of transport network, and to require players to choose appropriate vehicles for particular tasks. Examples of where way constraints might be used are given above.

Bridges and elevated wayslink


In Simutrans-Standard, bridges can have length and height restrictions, but these are optional. Height restrictions do not discriminate between height above and below water. Where the overall length of a bridge is not restricted, it is possible to build a bridge over a large stretch of open ocean. Further, elevated ways can be built over buildings of any height.

In Simutrans-Extended, bridges with unlimited length cannot be built over deep water (that is, water more than 1 tile below sea level). Further, elevated ways can only be built over buildings of a size of no greater than 2, and larger buildings cannot appear under existing elevated ways.

The aim of this feature is to prevent players building very long bridges over open seas which would not be possible to build in reality, at no greater cost than building bridges on land, which can distort water transport, and further to impose realistic restrictions on the use of elevated ways in heavily built-up areas, confining them to the suburbs of larger towns and cities, and providing incentive to use (more expensive) underground railways instead.
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