Maybe pictures will help?

Note that the track frame has 75° head tube and seat tube angles, whereas the road frame has a more relaxed 72° head tube and seat tube angle. The track frame has shorter chainstays (440 mm vs 460 mm for the road frame), and less fork rake (20 mm vs 35 mm for the road frame) resulting in a shorter wheelbase for the track bike.

The steeper head tube and seat tube angles, shorter chainstays, and reduced fork rake of the track bike make the handling quicker and steering a little less stable than the road bike.

These Nervex frame designs are from the late 1950s, but today's traditional geometry frame designs haven't changed much.