Miscellaneous queries re Signalling Layout

[PJW]

I have been asked the following- anyone wish to venture some answers before I respond?

[quote]
Dear Sir,
I have some very basic doubts.
Kindly clarify the following,

#1 Length of Passenger train is 200m( which includes 2 locos), similarly the length of freight train 400m (which includes 1 loco) - Is it so?

#2 While performing a run round movement or reversing move, if the standage of the line is say 400m, then how it can be done for a freight train of length 400m

#3 If a signal is placed within SIP what will be the normal aspect of the signal.(For AHBC, ABCL)

#4 If a signal is placed inside a tunnel, what precautionary measure we have to adopt?

#5 Please explain the logic behind MAY-YY in 4 aspect signalling.

#6 When the speed difference between main line and divergence is 33% can we go for MAY