DETAILED DESCRIPTION What is claimed is: 1.
A cross frog zone (10, 12) for switches and crossings, including a cross frog tip (14, 24) and, extending at both sides thereof, wing rails (16, 18) and running rails (20, 22) having a basic shape (38, 40) aligned with a main or branch track (26, 28), the cross frog zone being traversable by a railroad vehicle having a wheel- or bogie-axle with wheels, wherein at least one of the running rails (20, 22), in a region of the cross frog tip (14, 24), has a shape change (34, 36) deviating from its basic shape (38, 40) in such a way that a wheel traversing the running rail is held to a running circle of radius r.
sub.
1 which is smaller than a running circle of radius r.
sub.
2 to which a wheel rolling on the cross frog tip is held.
2.
A cross frog zone according to claim 1, wherein the radii r.
sub.
1 and r.
sub.
2 have a ratio of approximately as r.
sub.
1 :r.
sub.
2.
apprxeq.
0.
91:1 to r.
sub.
1 :r.
sub.
2.
apprxeq.
0.
98:1.
3.
A cross frog zone according to claim 1, wherein in the region of the cross frog tip (14, 24), the running rail (20, 24) has, with reference to its line of contact (52) formed by the respective point of support of the wheel, a shape which is curved away from the cross frog tip.
4.
A cross frog zone according to claim 1, wherein the region of the cross frog tip (14, 24), the running rail (20, 22) is more strongly inclined to the cross frog tip (14, 24), with reference to its running surfaces, in comparison to the running rail in the basic shape (38, 40).
5.
A cross frog zone according to claim 1, wherein the running rail (20, 22) at its running surface, in the region where the shape change (34, 36), extends inclined at an angle .
alpha.
a relative to the cross frog tip (14, 24), relative to the running rail in the zone of its basic shape, where 1.
5.
degree.
<.
alpha.
<5.
degree.
.
6.
A cross frog zone according to claim 1, shape change (34) of the running rail (20) of the main track (26) begins at a distance X.
sub.
h in front of the cross frog tip (14, 24), where 5,000 mm<X
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Gutter-related 
