Ask the Experts / Zero Clearance - Absolute/Relative ?

In the 8 cars trainer, what is the difference between the two different types of Zero Clearance? One is "Absolute", and the other is "Relative".

zero clearance zeros the clearance. basically nothing is "there"
relative drops all objects height by about 4 units or so. not sure on the exact figure.

Absolute: basically makes everything appear like it isnt there, giving you the ability to build through anything.

Relative: like Sssam said, drops stuff so that you can build through things, but not everything like with absolute. This would be better for custom supports and such.

I always thought relative meant for the piece of track you're about to build but nothing else.

Heh I've always wondered that

I always thought relative meant for the piece of track you're about to build but nothing else.

yeah.. me too.