On 10/05/2018 20:48, Max Demian wrote:
On 10/05/2018 15:12, Bill Wright wrote:
On 10/05/2018 10:04, Graeme wrote:

It is a problem those of us involved with old toy trains are well
aware of, using up to, say, 20v/5amp, but more usually 12-15v/1amp.
Even with longer track lengths (36 inches) and good, tight rail
connections, the difference across an oval can be substantial,

An oval? I thought it was two semicircles connected by two straights?
For an oval you'd need an infinite range of differently curved tracks,
wouldn't you?

You're thinking of an ellipse. Oval is a much vaguer term.

An ellipse is a line following a specific mathematical equation.

An oval is a squashed circle and only needs only symmetry in one plane.

A racetrack with two semi-circles is not an ellipse.
https://en.wikipedia.org/wiki/Stadium_(geometry)