John Amrstrong in Track Planning for Realistic Operation makes a couple of interesting points which have stuck.

1. Try and make a portion of track laid down for more than one purpose. (Efficiency in the use of the available space)
2. Don't repeat the same thing twice.
3. Plan for more edge (accessibility)

With point 1, I think going with a longer road number 2 followed by a left hand point into the yard proper about 100cm farther down which creates a Road Number 2a (see Nhill track diagram )
- this in effect can also be used as a head shunt.

With Point 2 i touched on in my previous post - why create another town with the same core principal which is to shunt and take refugee for a cross

With point 3, try and plan to lay your tracks closer to you rather towards the back for cleaning and maintenance, depending on height, 60cms to reach could cause problems.

Here is a youtube video of a train length which seems realistic for a B Class (could even get away with a double header S and B? Not sure.)