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I did not say that I am about to make a mod about this.

Is there a way to lower a train's top speed when going over a curved track (in automatic mode only) so that it will slow down as anticipation and takes the turn... realistically? I am thinking of a bullet train mod, with a train that moves on a very extreme top speed but is unable to take turns with it, and must slow down to a rather slow approach with a turn.

Or... is it possible to set something like this on the curved track itself like... top speed or top speed multiplier?

Nope, nope and nope. Unless you want to do tons of scripting.

eradicator wrote:Nope, nope and nope. Unless you want to do tons of scripting.

I figured...

I was hoping that there was actually a way to do this.

It's probably not as hard as all that. I'm guessing you can add a chain signal-like property to the curved section of the track, by which means detect when a train is approaching a curved section and thus command it to put on the brakes. A likely downside to this is that it will slow down at any branch even if it is taking the straight option, as it would probably be quite hard for it to tell the difference between a curved rail it is about to travel on, and one it is about to fly by. In the mean time, it won't slow down at an intersection it doesn't have the option to turn onto if all the tracks passing through it are straight. I recommend starting your mod by adding a speed limit to a normal chain signal.

probably possible featherwinglove. i played on a friends server that had an intersection that seem to make trains slow themselves down.

Well... hmm it could be possible to make trains take significant damage and possibly blow up when taking turns at very high speeds forcing players to set up circuit network contraptions with train signals before the turn. ...or just place turns at the beginning/end of the route like the following. This could however cease functioning after a number of upgrades to the brake system, and making something stop functioning after a while is not a good way to nerf it. Slashes are intersections.

Yes.

https://mods.factorio.com/mod/train-speed-limiter

I'm working on updating it...

was looking to see if there were classes of tracks yet...
Could add an option for slow on curves...

I notice that trains in V17 can now can show you the route they plan on taking. If I were to do some sort of code like this, a solution is to start at the end of the route and work backwards. At the end you start your speed limit at zero. Then, moving backwards bring the speed limit up, noting every curve and switch. At the curves and switched you set the speed limit back down to whatever you like for curves and switches. After each curve and/or switch start building back up to the top allowable speed again. This gives the train a speed limit profile that allows for braking.

The rate you use to bring up the speed limit after stopping, switches & curves is the rate your train brakes can handle.

I know this works because I used it on a programmable XYZ positioning robot, many many years ago.

-jim lee