Hello Michael,

the problem was that the network factory need curves that are already added to the database - otherwise the factory shows this in the crash report:

.\Init.cpp 501: Moi starting up
Current command = none, Version = Sep-18-2014
7 network V1
5
22 objectlist 8 U curves0
22 objectlist 8 V curves0
21 string 4 Mode6 normal
49 double 16 Custom tolerance3f847ae147ae147b (0.01)
27 int 18 Uniform Num Points10

It reminds me to the 'removeduplicates' factory.

Now I can fix some other problems:-)

Many thanks and
have a nice day
Karsten

p.s.:
@ James - Is railrevolve already distributed?

function RailRevolve()
{
	this.addInput("Profile","objectlist");
        this.addInput("Rail","objectlist");
	this.addInput("Frame","pointarray");
	this.addOutput("Out","objectlist");
	this.properties = { mode:[/*"Union","Union"*/"Long","Long","Short"], cap_ends:["On","On","Off"]};
}

RailRevolve.title = "RailRevolve";
RailRevolve.desc = "RailRevolve";

RailRevolve.prototype.onExecute = function()
{

	{
		var data = this.processInOut(this.properties.mode[0], this.multiProcess,null, null, null );
		this.setOutputData(0, data.outputs[0]);
	}
};

RailRevolve.prototype.multiProcess = function(prof,rail, f)
{
	var frame = f.getFrame();
	return [factory ('railrevolve', prof.item(0),rail.item(0), frame.origin, frame.evaluate( 0, 0, 1 ), this.properties.cap_ends[0] === "On")];
};

LiteGraph.registerNodeType("Construct2/RailRevolve", RailRevolve);