In undertaking work to bring a full range of liveries to the BR Mk. I carriages in the Experimental version of the pakset, I have undertaken some work in improving the graphics generally. That work is in
this commit, and also includes setting separate front/rear brakes for the brake ended vehicles.
Improvements include:
* much better alignment of the BR Mk. I suburban vehicles;
* improved bogie graphics on all vehicles;
* correct end colours for earlier vehicles;
* separate door colours for gangway doors a the ends of carriages;
* lining out and logos on the maroon livery (which otherwise looks very dull and dark); and
* improved text for the mail and buffet vehicles.
A word about bogies and text: bogies in the earlier vehicles seem to have been drawn with wheels fully exposed on the outsides, whereas most carriages and locomotives (with a few exceptions, such as the BR Class 220 "Voyager" DMUs and the BR Class 52 "Western" locomotives) have outside framed bogies. This detail is quite clearly visible in a 128x128 image, and vehicles with bogies drawn as if they were inside framed have rather a toy train look about them. I am eventually to replace all incorrect inside frame graphics, but this will take some time.
As to text, in many cases in the default graphics, text is represented by a box. Although it is not possible to read the individual letters in a 128x128 image, save for the very largest of letters, there is still a noticeable difference at that level when writing actual text as opposed to using a box. Look carefully at the example of the Intercity liveried BR Mk. I RBR for an example:

Another example is in this 1950s TPO vehicle:

Although it is not possible actually to read the words "Royal Mail", the words have the recognisable approximate shape of the words "Royal Mail", and look much better than a box.
Some more sample graphics follow.

BR Mk. I BSO in lined maroon livery

BR Mk. I Gangwayed brake in ScotRail livery

BR Mk. I corridor second in carmine and cream livery

BR Mk. I suburban carriage in BR blue livery

BR Mk. I corridor brake in NSE livery

BR Mk. I corridor brake in Regional Railways livery