Interesting ... Looking at the diesel loco the front it's pretty sharp where you were tracking ... bit difficult to tell what's happening with the wheels.
For the Oli Cromwell, its nice & sharp in the middle of the engine particularly around the centre of the three large wheels .... where you were tracking and there's some great motion blur in the wheels.
So why isn't more of the image sharp? In this case the subject is tracking at an angle to where you are stood. Looking at the Oli Cromwell shot ... both the front (in advance of the tracking point) and the back (behind the tracking point) show blur. Because of the angle, parts of the subject in front of the tracking point are moving (relative to where you are stood) faster than the tracking point and those to the rear slower ... so both are blurred relative to the tracking point.
I would say your panning is pretty much spot on relative to the points you were tracking ... to get more of the image sharp - you need to press the button when the line of motion is at a 90 degree tangent to where you are standing - them the points in front & behind the tracking point are moving at the same (relative) angular speed.
The challenge is then that this is the fastest point of panning ... and you don't get any lead lines for your composition so you need to allow space for the train to move into. Practice, practice, practice - get on a street corner & photograph the fiestas & mondeos - lol
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