Opal Card Price Bands - Mount Druitt Misses Out On Lower Price Band by 11-6 Metres Reaching Parramatta Train Station!

I have personally made some investigations and made a discovery 

Mount Druitt (West) train station distance to Sydney

that due to the the Fare Bands Opal say is set by NSW for Transport. Yet when I ring up NSW for Transport, they say it is set up by Opal.

Click here for Opal Train Fares 

On the right there are picture of  Sydney Rail distances to 
Sydney from designated poles along the Railway Line. "SL"
stands for Sydney Line.

Mount Druitt (Middle) train station distance to Sydney

 I have taken 3 pictures from Mount Druitt Train Station and 2 from Parramatta Train Station. What is intriguing is the distance from Mount Druitt to Parramatta is within the 2 10-20 and 20-35 Km bands.

Mount Druitt (East) Train Station distance to Sydney

In fact, according to the fare bands where opal measured distances between Mount Druitt and Parramatta train stations as 20.7Kms.  Yet, the best I can do in working out the distances from these poles is 20.071 Kms, as you can plainly see: 43.304 - 23.23 = 20.071Kms

Parramatta (Middle) Train Station distance to Sydney

This means if the train stations were 71 metres closer to each other, then and only then would the fares of both Parramatta and Mount Druitt commuters would be in the lower fairer band.

Parramatta (East) Train Station distance to Sydney

Just for your information: where the Mount Druitt (Wesst) distance pole, is probably placed 10-15 metres from the East end of the platform. The Parramatta (East) distance pole, is probably based 30-40 metres, from the East end of the platform. That would then mean the distance is reduced 60-65 metres less leaving the distance 11-6 metres. How close are we to qualify for the lower band?

My guess is distances between train stations are measured end to end. That is west of platform to East of platform and visa versa?

What are your thoughts? Are the Opal Fares fair for Mount Druitt commuters traveling to and from Mount Druitt.