Hi Andy.
To (hopefully) cure the coaches bouncing and colliding off each other, open the ENG and WAG files and look for this section normally in the top sections of both ENG's and WAG's.
Coupling (
Type ( Automatic )
Spring (
Stiffness ( 2e6N/m 0 )
Damping ( 6e9N/m/s 6e9N/m/s )
Break ( 5.1e7N 5.1e7N )
r0 ( 10cm 1e9 )
)
Velocity ( 0.1m/s )
)
Buffers (
Spring (
Stiffness ( 1e7N/m 0 )
Damping ( 1e6N/m/s 0 )
r0 ( 0m 1e9 )
)
CouplingHasRigidConnection ( 1 )
Centre ( 0.5 )
Radius ( 0.98 )
Angle ( 0.5deg )
)
If the
RED line is missing, add it as shown, and it should
hopefully cure the problem.
It is sometimes there but commented out, if so it will look something like:
Comment( CouplingHasRigidConnection () )
If so, amend so it looks like my red section above and it should all be fine and dandy.

The same line will need to be amended/added to
ALL coaches and engines for it to work properly.
Also a possible patch for the author.
