long and short train

[Peter]

What problem happens operate long train and short trains in track circuit of system???

Are you referring to the issue of who the maximum an minimum TC lengths are constrained and the issues with physical stagger of block joints?

MINIMUM TC length is determined by the length of the LONGEST wheelbase train operating on the network. The SHORTEST TC must be LONGER than the maximum distance between the inner wheels of a wagon so that a wagon cannot "bridge" over a complete TC section.

The physical stagger of block joints is governed by the SHORTEST wheelbase vechicle such that a vehicle cannot sit entirely within the dead section of TC that occurs where block joints are not directly opposite eachother.

Max TC length is determined (mostly) by electical characteristics.

If that is not what you are asking, please let me know.

Peter